Acromis venosa Erichson 1847

Chaboo, Caroline S., 2001, Revision And Phylogenetic Analysis Of Acromis Chevrolat (Coleoptera: Chrysomelidae: Cassidinae: Stolaini), The Coleopterists Bulletin 55 (1), pp. 75-102 : 95-97

Acromis venosa Erichson 1847

Figs. 6–7, 10–13, 21–22

Acromis venosa Erichson 1847:153 [original description]: Boheman 1854:98 [synonym of S. venosa ]; Blackwelder 1946:743 [checklist]; Borowiec 1996:122 [distribution]; Borowiec 1998:170 [distribution].

Selenis venosa (Erichson) Boheman 1854:98 [synonymy; description]; Boheman 1856:86 [catalog]; Chapuis 1875:401 [characters]; Spaeth 1914:52 [catalog]; Blackwelder 1946:743 [synonym of A. venosa ].

Diagnosis. This species can be recognized by the acuminate posterior apices (Fig. 10) of the elytra in both sexes. The spermatheca ( Fig. 21 ) shows subtle differences in the appendix margins and receptacle base from those in the other species. Specimens tend to be much darker than specimens of A. spinifex .

Body color ranges from dark brown to black, with a darker maculation lending a mottled appearance. Ventrally the mouthparts are brown to dark brown, and the posterior margin of the abdominal sterna tan to dark brown

Description. Adult. Male ( Fig. 12 ) length 11–12.4 mm, width 7.9–9.6 mm. Female length 8.8–12.4 mm, width 6.7–11.9 mm.

Head ( Fig. 13 ): Clypeus, shape hemispherical, slightly protuberant from genae. Thorax: prosternal collar well­defined, posterior grooves present; medial depression present; surface with fine irregular ridges, sparsely punctate; pronotal basal margin with midposterior angles; pronotal margin curved along window between pronotum and elytra. Elytra: humeral ridge extending from elytral margin, across humeral angle and tapered near discal margin; disc with ridge near elytral suture, behind scutellum. Male genitalia: no apparent variation. Female genitalia: no apparent variation. Spermatheca ( Fig. 21 ): appendix distal margin shallowly concave, proximal margin sinuous; receptacle base not developed, duct continuous with long axis of receptacle; duct, proximal section with approximately four coils.

Type Material. Holotype male. Deposited in Museum fur Naturkunde der Humboldt Universitat, Berlin, Germany. Type locality: Peru, Mont. Phil. ZMHUB catalog number 14216.

Distribution. Previously published localities include Ecuador, Bolivia and Peru ( Blackwelder 1946; Borowiec 1998). I examined specimens from Argentina, Bolivia, Brazil, Colombia, Ecuador, Guyana, and Peru.

Specimens Examined. Holotype, and 127 specimens with the following label data:

BOLIVIA: (2, ZMHUB); Yungas de la Paz (3, ZMHUB); Yungas de la Paz, coll. Heyne V. (2, ZMHUB).

BRAZIL: (5, BMNH) ; Canavieras , Bahia, III.1945, coll. A. Mahler (17, AMNH) ; Estado do Bahia, coll. G. Bondar (34, FMNH; 2, CAS) ; Bahia (1, MACN) ; Bahia, XII.1945, coll. Bondar (4, USNM) ; Bahia (1, IMLA) ;

COLOMBIA: Rio Negro (5, ZMHUB);

ECUADOR: (1, ZMHUB; 3, BMNH); nr. Macas el Oriente, 2.XII.1922, coll. F. W. Goding (1, USNM) ; El Napo, El Reventador , VI.1986, coll. G. Onore (1, EGRC) ; Illiacas , coll. Buckley (2, BMNH) ;

GUYANA: (1, USNM);

PERU: (1, BMNH; 4, MACN; 1, ZMHUB) ; coll. M. Berl (3, NHRS); Chaquimayo (3, FMNH; 3, NHRS; 3, ZMHUB); Chancho (3, BMNH); Chanchamayo (1, LBC); Cuzco, 30 km W Quincemil, 30.I.1979 , coll. J. E. Steiner (3, USNM); Cuzco, 10–30 km W Quincemil , 28.II.1978 , coll. University Maryland Expd. (2, USNM); Callanga , 1,400 m, 20.II.1953 , coll. F. Woytkowski (1, USNM); Callanga , 1,400 m, 23.II.1953 , coll. F. Woytkowski (1, USNM; 5, MACN); Jauja Prov., Satipo , VI.1945 , coll. P. Paprzycki (1, AMNH); Quincemil , Cuzco, 2,400 ft, 13.IV.1947 , coll. J. C. Pallister (1, AMNH); Marcapata (1, FMNH); Mont. Philip (5, ZMHUB); Poucartambo, Pilicpata , 14.II.1965 , coll. O. Ochoa M. (1, MACN); Lunguipata (1, LBC) .

Variation. Color varies from dark to reddish­black. The underlying maculation is variable in extent and intensity. The extent of the crenulation along the margin of the humeral fold is variable.

Remarks. The type specimen has a ‘‘*’’ on Erichson’s original data label to distinguish it in the original series. The series was collected from the same

locality and share the same MNHUB catalog number, 14216. The original description reads: ‘‘ A. obscure aenea , elytris sanguineo­venosis. —Long. 5– 51/2’’ ( Erichson 1847). This lacks details that could distinguish A. spinifex and A. venosa .

Eggs, larvae, pupae and natural history information are unknown.

Figures

Figs. 13–22. Acromis spp. 13) A. venosa, head, ventral view, scale bar = 0.5 mm. Figs. 14–17) A. spinifex, mouthparts, scale bar = 0.2 mm. 14) labrum; 15) mandible; 16) maxilla; 17) Labium; 18) A. sparsa, aedeagus, scale bar = 0.5 mm. Figs. 19–21) Spermatheca, scale bar = 0.25. 19) A. sparsa; 20) A. spinifex; 21) A. venosa. Fig. 22) A. venosa, wing, scale bar = 1 mm.

Fig. 12. Acromis venosa Erichson, male, dorsal habitus.