ART. 23 BE VISION OF MACROCENTRUS MUESEBECK 51 



Abdomen a little longer than head and thorax combined, com- 

 pressed apically ; first tergite slender, more than three times as long 

 as broad at apex, not distinctly impressed at base in front of spira- 

 cles, the latter prominent, a little farther from base of tergite than 

 from each other; second and third tergites not distinctly separated, 

 the second suture wanting or veiy faint ; dorsal surface of abdomen 

 smooth, sometimes with a little faint sculpture on first tergite ; ovi- 

 positor sheaths shorter than height of apical truncature of abdomen. 



Testaceous or ferruginous ; the head in front, pleura, and sternum 

 usually paler; antennae usually testaceous, brownish apically, but 

 sometimes flagellum entirely dark ; vertex completely black ; usually 

 mesonotal lobes more or less blackish down the middle, wings hyaline, 

 veins brown, stigma testaceous; legs testaceous, hind tarsi pale 

 yellow. 



The national collection contains 34 specimens; of these 4 were 

 reared from Psycomorpha epinienis Drury at Green Village, N. J., 

 by Charles Rummel; the remainder are collected specimens from 

 various localities in Maryland, Virginia, Pennsylvania, District of 

 Columbia, North Carolina, Kentucky, Georgia, Illinois, and Kansas. 

 I have also examined 11 specimens taken at Raleigh, N. C, which 

 were sent me by C. S. Brimley ; a single specimen at the gipsy moth 

 laboratory reared from Alypia octortmculata Fabricius by J. V. 

 SchafFner, jr., the host having been taken at Brockport, N. Y. ; and 

 a specimen at the Academy of Natural Sciences of Philadelphia 

 labeled ''^ Macrocentrus uniformis Cress. MS." 



