2 University of Michigan 



A few abbreviations have been used : s.m. — submarginal 

 cell; t.c. — transverse cubital nervure ; r.n. — recurrent nervure. 



a^. Anterior zvings icith tzvo subnmrgi)ial cells. 



b\ Small black species, zvith yellow spot on tubercles; stigma 



well developed. 

 c^. face of female almost wholly black; upper border of proth- 



ora.v zuifh yellozv marks. 



Prosopis gaigei n. sp. 



Female. Length about 6 mm., black, the face without light 

 markings except some microscopical yellow spots at sides ; 

 collar above with two slender yellow lines, tubercles with a 

 large chrome yellow spot, hind tibiae broadly yellow at base ; 

 tegulae entirely black, minutely sculptured with concrete lines ; 

 wings smoky ; second s. m. large, tirst r. n. meeting first t. c. ; 

 flagellum only obscurely dark reddish beneath. Head rather 

 long; mesothorax and scutelhuii strongly punctured; area of 

 metathorax rugose ; first abdominal segment shining, im- 

 punctate, remaining segments very minutely roughened. 



Floodwood, Schoolcraft Co., Alichigan, July 26, 1915- 

 (Gaige, 29, 30), 29 is the type; 30 unfortunately lacks the 

 head. On account of the black face, this at once suggests 

 P. personatella Ckll. from Colorado. P. personatella is how- 

 ever very distinct, having a shorter head, much more finely 

 sculptured mesothorax, and dark tubercles. On account of the 

 long face, this cannot be a variation of P. modest a Say. The 

 minutely aciculate, sparsely and shallowly punctured clypeus 

 of P. gaigei is 700 microns long and 370 microns wide at top, 

 thus unusually long and narrow. The coarse irregular sculp- 

 ture of area of metathorax and more sparsely (though very 

 distinctly ) punctured pleura indicate that P. gaigei is not a 

 melanic P. ellipiica Kirby. 



