Lasiochilus Reuter, 1871

Carpintero, Diego Leonardo, 2014, Western Hemisphere Lasiochilinae (Hemiptera: Heteroptera: Anthocoridae) with comments on some extralimital species and some considerations on suprageneric relationships, Zootaxa 3871 (1), pp. 1-87 : 50-52

Lasiochilus Reuter, 1871

Lasiochilus Reuter, 1871: 562 . Type-species by monotypy: Lasiochilus pallidulus Reuter, 1871 .

DESCRIPTION: Male: medium-sized species, oblong-oval, not flattened dorso-ventrally. Head: antennal segment II 2.5x the length of I, with sparse pilosity, segment I and II with setae of length not larger than twice the width of segment; labium shorter (subgenus Semiotoscelis ) reaching middle of mesosternum or longer (subgenus Lasiochilus ) reaching midcoxae; segment I very short, not reaching base of antennal segment I. Thorax: Pronotum smooth, laterally not carinate (excepting in duckei ), slightly elevated calli; collar present, lateral margin not sinuate. Midfovea present; longitudinal median sulcus absent. Scutellum punctured. Hemelytra straight, deeply punctured on clavus and endocorion; from each of these punctures emerges a seta. Membrane pruinose. Cuneus smooth. Ostiolar peritreme short and slightly curved towards the back ( Figs. 15–16 ); forefemora enlarged, unarmed. Foretibiae with row of teeth. Foretrochanters, sometimes also forecoxae, with row of tooth-like spines on their inner margin, probably having a stridulatory function. Metasternum elongate with thick prominence. Abdomen: Characteristic row of transversal punctures on urosternites. Genitalia with left paramere long, curved with apex acute. Right paramere absent. Grouping of copulatory spines on apical left margin of sixth sternite, apically rounded, toothlike.

Female: Similar to male in measurements and coloration; forelegs more slender and unarmed. Genitalia: most of species with parietovaginal gland (inapparent in L. duckei ). Central punctures on seventh sternite present in some species.

DISTRIBUTION: This genus is distributed from southern United States to central Argentina (Buenos Aires).

DISCUSSION: Many Old and New World species were described in this genus. Author considers (see discussion on Dilasia ) that the group formed by L. pallidulus and its related species is restricted to five species (two of them new) separated from Dilasia , the most closely related genus, by having strong punctures with emerging setae on clavus and endocorion and by the shape of the sexual secondary structures on males. Considering the extreme diversity of Lasiochilinae , Reuter’s subgenus of Lasiochilus , Hapa is here synonymized with the nominotypical subgenus. The characteristic pterygodimorphism of Hapa , also present in the other new species of this genus, L. colpoides (female macropter and male brachypter) and in Dilasia neotropicalis and D. varicolor (with macropterous and brachypterous females), and L. pallidulus , Dilasia carvalhoi , Eusolenophora testaceoides and E. divisoides (with brachypterousy present in both sexes), means that this character is variable and present in other genera and not useful to grouping species. Semiotoscelis Reuter, 1884 is retained as subgenus of Lasiochilus and will be discussed in detail later in the publication.

Key to species of Lasiochilus

1. Large eyes; frons rather narrow, with two impressed arched lines. Labium reaching middle of mesosternum................................................................................... s.g. Semiotoscelis Reuter, 1884 ......... 2

- Smaller eyes, frons with no impressed and arched lines. Labium reaching midcoxae... s. g. Lasiochilus Reuter, 1871 ......... 3

2. Larger, more elongate species (2.75 mm); piceous.................................... L. (S.) curvicrus Reuter, 1884

- Smaller, broader species (1.5–2.2 mm); paler; obovate ( Fig. 196 )................................ L.(S.) duckei n. sp.

3. Brownish species; left paramere strongly curved inwards (90º) ( Fig. 210 )........................ L.(L.) colpoides n. sp.

- Testaceous to yellowish species; left paramere sligtly curved inwards............................................ 4

4. Left paramere shorter, wide, with external margin slightly angulated and tip acute ( Fig. 216 ); interocular space wider (0.29 mm)................................................................. L.(L.) hirtellus Drake & Harris, 1926

- Left paramere longer, narrower, with external margin curved, and apical portion narrow ( Fig. 228 ); interocular space narrower (0.26–0.27 mm).............................................................. L. (L.) pallidulus Reuter, 1871

Figures

FIGURES 1–16. Left metapleura of different genera of Lasiochilinae showing the ostiolar peritreme and metapleural microsculpture. 1–2, Plochiocoris (350X and 1000X respectively); 3–5, Eusolenophora (350X, 1000X and 2000X); 6–9, two species of Lasiocolpus showing the small specific differences following a generic pattern: 6–7, L. minor (200X and 1000X) and 8–9, L. sinuaticollis (200X and 1000X); 10–12, Anaelia (200X, 1000X and 2000X); 13–14, Dilasia (200X, and 2000X); 15–16, Lasiochilus (200X, and 2000X).

FIGURES 195–199. Species of genus Lasiochilus. 195, L. (L.) colpoides Female, holotype (3.12 mm); 196, L. (S.) duckei Female, holotype; 197, L. (L.) hirtellus Male (3.08 mm); 198, L. (L.) pallidulus Female; 199, Idem. Female, holotype (2.63 mm).

FIGURES 201–214. L. (L.) colpoides. Male. 201, Head; 202, Pronotum; 203, Foretibia showing the teeth (Te) on internal margin and pad (Fos); 204, Apical half of foretibia; 205, Teeth on foretrochanter (Tte); 206, Sternum and base of abdomen showing the metasternum (Ms); 207, Brachycerous hemelytron; 208, Copulatory teeth (Cte); 209, Pygophore showing left paramere (LP); 210, Detail of left paramere. Female. 211, Macrocerous hemelytron; 212, Genitalia showing parietovaginal gland (PG); 213, Row of hairs (Rha) in the centre of every urosternite; 214, Detail of parietovaginal gland (PG).

FIGURES 215–216. L. (L.) hirtellus. Male. 215, Copulatory teeth (Cte); 216, Pygophore showing left paramere (LP).

FIGURES 217–231. L. (L.) pallidulus. Male. 217, Head; 218, Pronotum; 219, Foretibia showing the row of teeth (Te) on internal margin, teeth on foretrochanter (Tte) and pad (Fos); 220, Apical half of foretibia; 221, Teeth on foretrochanter; 222, Sternum and base of abdomen showing the metasternum (Ms); 223, Hemelytron; 224, Detail of punctures of hemelytron; 225, Copulatory teeth (Cte); 226, Detail of copulatory teeth (Cte); 227, Last abdominal segments showing left paramere (LP) and copulatory teeth (Cte); 228, Detail of left paramere. Female. 229, Genitalia showing punctures (Pfg) and parietovaginal gland (PG); 230, Detail of punctures on centre of VII sternite; 231, Detail of parietovaginal gland.