320 T. D. A. COCKERELL. 



C. frontale. C trifasciatum. 



Spinoliella-Wke in appearance. Bather Colletes-Wke in appearance. 



Smaller. Larger. 



Very little hairy. Rather hairy. 



Abdomen with four cream-colored teg- Abdomen with hair-bands like a Calli- 

 umentary bands, like a Spinoliella. opsis. 



B. n. falls far short of t. m. B. n. meets t. m. 



Supraclypeal mark, and a small spot Supraclypeal mark, and a spot on each 

 just below it (on clypeus) cream side of it, cream color, 



color. 



Abdomen without any bluish or green- Abdomen with a strong bluish or green- 

 ish lustre. ish lustre. 



Second submarginal cell longer than Second submarginal cell scarcely longer 

 first (considerably longer below). than first. 



C. trifasciatum has the marginal cell obliquely truncate ; the 

 lateral lower corners of clypeus are produced downwards into a 

 spine, as in some forms of Perdita. In Ashmead's tables this spe- 

 cies runs to Camptopozum, though it does not agree with the char- 

 acters of the genus. 



The type of Spinoliella is the Chilian S. nomadoides ( Campto- 

 pozum nomadoides Spin.). I have not seen this insect, but the 

 American S. scitula and S. australior are easily separated from the 

 above two species of Camptopozum by the fact of having the first 

 submarginal cell longer than the second, as is duly indicated by 

 Ashmead in his original description of the genus. They resemble 

 C. frontale, and differ from C. trifasciatum in having the b. n. fall- 

 ing far short of t. m. To all appearances C. frontale is nearer to 

 Spinoliella scitula and australior than it is to C. trifasciatum. 

 According to Friese, Camptopceum is almost naked, always marked 

 with yellow. Two species (C. handlirschi and rufiventre) have the 

 abdomen red, banded with yellow. 



By the characters cited, it appears evident that C. trifasciatum 

 must form the type of a new genus. 



ACAMPTOPffiUM n. g. 

 Type, Acamptopveum trifasciatum (Camptopceum trifasciatum Spi- 

 nola, 1851). 



PS^ENYTHIA Gerstaecker. 

 Pssenythia burmeisteri Gerst. 



Dalla Torre gives this as from Brazil ; the label on the specimen 

 examined states it to be from the Argentine Republic. Face marks 



