20 PEOCEEDINGS OF THE NATIONAL MUSEUM vol. 70 



Tijfe locality. — Amazon (H. W. Bates). Also from Ega and 

 Para, Brazil (H. W. Bates). 

 Type. — In British Museum. 

 This species closely resembles Trigona goettei Friese. 



MICRODON (UBRISTES) FRAUDATOR. new species 



Male. — Very similar to goettei in coloration and to trigonifonnis 

 in structure. Antennal joints 1 : 0.25 : 1 ; face and front broader than 

 in trigoniformis; fore and mid legs yellow, tarsal joints 1, 2, and 

 3 dark bro^Yn ; hind femur j'ellowish, tibia and first three tarsal joints 

 dark brown, dorsal incision on tibia not as pronounced as in trigoni- 

 formis'^ abdomen as in trigonifonnis ; wings subhyaline, no whitish 

 stripe. Length, 8.5 mm. ; wing, 6 mm. 



One male. 



Type locality. — Amazon (H. W. Bates). 



Type. — In British Museum. 



MICRODON (UBRISTES) SCUTELLARIS, new species 



Female. — Differs considerably from the other species of this sub- 

 genus in having the abdomen broadly ovate and the scutellum pro- 

 duced apically and triangular in shape. Head black, front and face 

 unsually narrow, front nearly three times as long as broad, ocellar 

 region protuberant; antennal joints 1:0.25:1; arista shorter than 

 third joint; face narrowed downward, pale pilose, the sides whitish 

 pollinose; thorax dark brown, dark pilose; all the legs dark brown, 

 the apical tarsal joints yellowish; hind femur and tibia rather slen- 

 der, long dark pilose, the dorsal incision of tibia broad and rather 

 shallow; hind metatarsus of much larger girth than either femur 

 or tibia; abdomen brownish, the sides narroAvly yellow, second and 

 third tergites each with a large pair of yellow spots ; fifth tergite well 

 developed, yellow, with a median, longitudinal, dark stripe; wings 

 large, slightly infuscated, with a median, rather faint, whitish cross 

 stripe. Length 7.5 mm.; wing 8 mm. 



One female. 



Type locality. — Amazon (H. W. Bates). 



Type. — In British Museum. 



MICRODON SCOLOPUS, new species 



Male. — This species may be readily recognized by the presence 

 of a well developed tooth-like process at the base of each basitarsus. 

 In general appearance similar to certain species of the subgenus 

 Uhristes., but the hind legs lack the long pilosity which characterizes 

 this group. Ej^e margins parallel, the front and face less than one- 

 third tlie width of the head ; front dark, ocellar region protuberant ; 



