Centris (Heterocentris)

Vélez, Danny & Vivallo, Felipe, 2012, A new South American species of Centris (Heterocentris) Cockerell, 1899 with a key to the species with horn-like projections on the clypeus (Hymenoptera: Apidae: Centridini), Zootaxa 3357, pp. 49-55 : 54

Key to females of Centris (Heterocentris) with horns on the clypeus

1 Clypeus with two horns, each located at side of the clypeus............................ Centris bicornuta ( Figs. 9–10 )

1’ Clypeus with a single horn located centrally or near the epistomal suture.......................................... 2

2 Mandible dark brown, longer than the length of the eye (frontal view) and with two teeth relatively similar in size located in the distal half; disc of mesoscutum and external side of hind tibia with brown hairs; metasoma dark brown.................................................................................................. Centris cornuta ( Figs. 7–8 )

2’ Mandible predominantly yellow (except apex), shorter than the length of the eye (frontal view) and with the apical teeth differing in size (except C. adunca ( Figs. 5–6 ) with only one apical tooth); disc of mesoscutum and external side of hind tibia with yellowish hairs; metasoma with orange integument.......................................................... 3

3 Horn compressed dorsoventrally and with acute apex, surpassing the lower margin of the clypeus ( Figs. 1 and 2 ); mandible gently curved apically and with two teeth in the apical half; distal margin of labrum convex.... Centris ceratops new species

3’ Horn not compressed dorsoventrally and with bifid apex, not exceeding the lower margin of the clypeus; mandible apically angled and with only one tooth in the apical half; distal margin of labrum biconvex............ Centris adunca ( Figs. 5–6 )

Figures

FIGURES 5 – 10. Centris adunca (female, Brazil: Acre): 5, Head frontal view. 6, Head lateral view. Centris cornuta (female, Cuba): 7, Head, frontal view. 8, Head lateral view. Centris bicornuta (female, Costa Rica: Liberia): 9, Head frontal view. 10, Head lateral view. Scale bar: 1 (mm).

FIGURES 1 – 4. Centris ceratops new species (holotype female). 1, Head frontal view. 2, Head lateral view. 3, Head, posterior view showing the laminar projection of the gena. 4. Lateral view. Scale bar: 1 (mm), except figure 3: 0.5 (mm).