AMERICAN HALICTINE BEES IN THE BRITISH MUSEUM. 35 



first segment very narrow, second becoming broader 

 apically ; first r. n. meeting second t. c. ; antennae 

 moderate (Brazil) agilis, Sm. $ (T.). 



By the venation and the long antennas, the Chilian species 

 form a group separable from those of Brazil. In Proc. Acad. 

 Nat. Sci, Phila. 1901, p. 218, I misidentified C. jucunda, owing 

 to a misinterpretation of a sentence in the description. My so- 

 called jucunda will stand as G. (enigma, Gribodo, while my C. 

 pseudobaccha is the real jucunda. 



The antennae of C. discolor ( $ ) are bright orange at the tip, 

 a useful character to separate it from C. atromarginata. 



Augochlora titania, Sm. (T.), which I have referred to Cory- 

 nura, has a clavate abdomen, narrowed basally, but otherwise is 

 not suggestive of Corynura. It is very small ; first r. n. joining 

 second s.m. near its end ; no vibrissa? ; wings dusky; eyes deeply 

 emarginate ; area striato-granular. 



Corynura briseis (Augochlora briseis, Sm.) (T.). 5 . 



Hind spur with two spines and two nodules or extremely short 

 spines; second s. m. extremely narrow, receiving r. n. at its middle or 

 slightly beyond ; first abdominal segment broad but narrowed basally, 

 with strong large punctures, its dorsal surface, viewed laterally, occupy- 

 ing a much lower plane tban that of second; second segment with large 

 punctures like first, but third and beyond lack these punctures, and 

 have a greenish lustre ; no vibrissas ; upper part of metathorax smooth 

 and shining ; scutellum dark pinkish-purple ; mesothorax shining very 

 dark purplish, with large sparse punctures, its anterior margin sharp, 

 and overlapping prothorax. 



Megalopta. 



I discuss under this name the species here placed by Smith, 

 although it is evident that they do not form a natural group. 

 Eventually, either Megalopta must be given up, and its species 

 merged in Augochlora, or else it must be restricted to a much 

 smaller number of species. 



Bright blue-green; abdomen shining; thorax very 



coarsely sculptured . . . . . . ornata, Sm. 



Not so, colours dull ....... 1. 



1. Without metallic colours, or at most slightly purple . 2. 

 With bright metallic colours on some part . . 3. 



2. Wings strongly suffused with orange ; abdomen nar- 



rowed basally ; scutellum normal ; body dark 



purplish ....... purpurata, Sm. 



Wings not suffused with orange ; abdomen broad at 

 base ; scutellum bituberculate ; body not* purplish 



bituberculata, Sm. 



3. Abdomen pallid ....... 4. 



Abdomen dark. ....... 0. 



n 2 



