BEES IN BRITISH MUSEUM. 319 



scutellum and pleura nude, shining brick-red. Last an term al joint 

 obliquely truncate, the truncation shining; a small tooth on middle 

 of anterior margin of clypeus; mandibles tridentate at apex; b. n. 

 meets t. in. ; first r. n. joins second s. m. at its middle; nervures 

 with hyaline spots; abdomen dark blue; hind trochanters with long 

 hair, but not a curled fioccus ; the hair, however, is strongly plu- 

 mose, and the scopa of hind tibiae is also plumose. 



%. More slender; raesothorax black in middle; pleura black; 

 abdomen black ; anterior tibiae and tarsi red ; antennae black, fla- 

 gellum crenulate beneath ; mandibles bidentate at apex. 



STENOTRITUS Smith. 



This Australian genus is distinguished from Andrena by the 

 spurs of the middle tibiae, which are very long and pectinate with 

 numerous short spines. In addition to the two species given below, 

 the Museum contains a third (undescribed) species from W. Austra- 

 lia ; it is similar to elegans, but smaller. While S. smaragdinus 

 and S. elegans are congeneric, they are not closely allied. 



Steuotritus smaragdinus Sm. 9 (T-)- 



Like a very large, bright green Andrena; third antennal joint 

 very long; mesothorax with much white plumose hair; area re- 

 duced to a very minute basal nearly equilateral triangle; second s. 

 m. extremely broad, receiving first r. n. a little before its middle; 

 hair at apex of abdomen black ; pygidial plate large. 



Stenotritus elegans Sm. (T.). 



Not quite so large as the last; black, hair at apex of abdomen 

 rufo fulvous. Area produced apically, so as to form a broad band 

 passing down metathorax ; first r. n. joining second s. m. a little 

 beyond its middle. Last antennal joint ( 9 ) compressed, so as to 

 be pointed seen from above, rounded seen from in front. 



CAMPTOPCEUM Spinola. 



The European C. frontale (Fabr.), of which a 9 from Hungary 

 has been examined, must be regarded as the type of the genus. 

 The Chilian C. trifasciatum Spinola is very different, as the follow- 

 ing comparison shows : 



TEANS. AM. ENT. SOC. XXXI. AUGUST, 1905. 



