MEGACILISSA. 59 



hyaline, the nervures ferruginous, the tegulse pale rufo-testaceous. 

 Abdomen dark reddish brown ; the apical margina of the second, 

 third, and fourth segments narrowly testaceous and with a narrow 

 pale fulvous fringe ; those of the fifth and sixth segments fringed 

 Avith long black pubescence, the apical segment with fulvous. 



Hah. Mexico, Orizaba. 



This insect is very like the male of M. eximia, but differs from it 

 in the colour and pubescence of the posterior legs, and also in the 

 narrow pale margins of the segments of the abdomen. 



3. Megacilissa clypeata. 



Male. Length 7^ lines. — Black, with fulvous pubescence, which is 

 dense on the head, thorax, and first segment of the abdomen, rich 

 above, and paler on the body beneath. The clypeus yellow ; the 

 scape of the antennae, the flagellum beneath, and the apical joint 

 rufo-piceous ; the legs ferruginous, the posterior tibise darkest, aud 

 with fuscous pubescence outside ; wings hyaline, the nervures fer- 

 ruginous, the tegulse pale rufo-testaceous. Abdomen having the 

 second, third, aud fourth segments with their apical margins pale 

 rufo-testaceous, widely so in the middle, then narrowly, and again 

 widely so lateralh- ; beneath rufo-testaceous. 



Hah. Mexico, Oajaca. 



4. Megacilissa generosa. 



Male. Length 8 lines. — Head and thorax black ; abdomen dark 

 olive-green, with the legs black. The clypeiis and labrum yellow, 

 and covered with fulvous pubescence. The thorax with fulvous 

 pubescence, becoming dark rufo-fuscous between the wings, and 

 posteriorly so on the metathorax ; wings fulvo-hyaline, with the 

 nervures ferruginous, the costal nervure black ; the legs black and 

 with black pubescence, the tarsi ferruginous ; the pubescence on 

 the femora beneath pale fulvous. Abdomen with fulvous pubescence 

 on the basal segment, and also on the two apical ones ; on the 

 intermediate ones it is very short, thin, and black ; beneath, the 

 segments are fringed with long fulvous pubescence. 



Hah. Venezuela. 



