478 ^Ir. T. D. A. Cockerell — Desci'iptions and 



venation and middle spnr separate it frora A[. cai'idescens, 

 Lcp. 



Mesonychium decoratum (Sniitli). 



Bocas del Toro, Panama, July 6, 15)08 {W. Rohimon). 



This agrees with one from F. Smith's collection, obtained 

 by Bates in S. Panlo, Brazil. A form with l)roader pygidial 

 piate ( ? ) comes from Rio Mato, Venezuela, October 

 i^Carriker). 



Mesonychium azureuin gunteinalense (Cockerell). 



Cacao, Trece Aguas, Guatemala, April 4 {Barber ^ 

 Schicarz). 



This specimen shows that the type was partly denuded. 

 The disc of mesothorax and outer face of hind tibiae are 

 ornamented with green scale-like hairs. 



Mesonychium duckei (Friese). 



Cabima, Pauama, May 17, 1911 {Auf/. BuscJc). 



The third s.m. is very much broader below than in 

 31. decoratum, so that the venation approaches Cyphomelissa. 

 After reviewing the subject, I must agree with Duckc that 

 Mesonychium is the projjer name for this genus, including 

 Mesup/ia and Melissa, and also Cyphomelissa as now inter- 

 preted by Schrottky. 



Colletes cyanescens, Ilaliday. 



I have this from Santiago, Chile, and specimens marked 

 Southern Chile (M. J. Rivera) are in the U.S. National 

 Museum. C. atripilis, Vachal, is a synonym. 



Triepeolus pruiuosus, sp. n. 



$ (type). — Length about 9 mm. 



Black, the thorax densely ])uiictured and not shining; 

 basal half of mandibles red ; labrum dark reddish ; clypeus 

 very minutely and densely punctured ; scape red at base 

 and more or less at apex ; second and third antenual joints 

 bright ferruginous ; a conspicuous patch of creamy-white 

 hair on each side of antennaj ; mesothorax with a thin 

 pruinose pubescence, anterior margin with two nearly round 

 ij})ots of yellow pubesc^ence ; yellowish-white j)rothoracic 

 hair-band broadly interrupted in midillCj ending laterally in 

 round spot on base of tubercles; tubercles reddish ; hind 

 margin of mesothorax with a creamy hair-band j scutellum 



