22 ENTOMOLOGICAL NEWS. [Jan., '04 



a slight median line on the upper half and a narrow, median line 

 or rather impression on lower half. Metatarsus as long as the other 

 joints fused. Claws cleft, the tooth distinctly shorter than the claw. 

 Transverse median nervure received by the median cell about one-fourth 

 mm. basad of the basal nervure ; first and second recurrent nervures in- 

 terstitial or nearly i. e. a little basad of interstitial zvith (but with no 

 space whatever between} the transverse cubili. Area of marginal cell 

 about equal to second cubital j stigma at least four times as long as high 

 and a little longer than the marginal cell, distance between stigma and 

 insertion of first transverse cubitus in the marginal nervure about equal 

 to the width of the truncation in the latter; second division of radius 

 longer than the first, third longer than second, about as long as first plus 

 second. 



Abdomen. Sculpture much like that of dorsulum ; segments depressed 

 along posterior margin, more in the middle than on the side. Pygidial 

 plate flat, shining, triangular, narrowly but deeply emarginate at apex 

 forming a w. 



$ Length 5 mm. Much like the other sex except in color. Frontal 

 foveae a dot. With exception of some blackish sutures, spot on meso- 

 pleurae, spot on face mesad of fovea and dark tubercles, yellow. Wings 

 as in the female, but the recurrent nervures instead of being inserted 

 slightly basad of transverse cubiti are slightly beyond interstitial. 

 Type locality of gerhardi East Chicago, Indiana. 

 Prof. Cockerell' s table of the Yellow species of Perdita is as 

 follows : 



" About 4 mm. long, cheeks of $ armed with a stout spine i 



Larger, about 6 mm. or over, cheeks of $ not armed 2 



1 Head very large larreae Ckll. 



Head not nearly so large larreae var. modesta Ckll. 



2 8 mm. long, mesothorax pubescent, pleura with a black patch 



beata Ckll. 

 Smaller about 6 mm. long 3 



3 Very pale yellow 4 



Bright yellow 5 



4 Pleura with a black patch wootonae Ckll. 



Pleura without a black patch . . , . . perpallida Ckll. 



5 Pleura with a black patch, mesothorax hairy ; abdomen without Jis- 



tinct black bands gerhardi Vier. 



Pleura without a black patch 6 



6 Abdomen with four narrow black bands . howardiCkll. (flies in spring.) 

 Abdomen without such bands luteola Ckll. (flies in fall.)" 



Perdita monardae n. sp. 



Type locality, Riverton, New Jersey. 



