6 PROCEEDINGS OP THE NATIONAL MUSEUM vol.80 



Legs black, tarsi long, claws and piilvilli long, the latter brownish ; 

 front tibiae with one outer bristle below middle; hind ones irregu- 

 larly bristled on outer side. 



Wings hyaline, third vein with 2 to 4 setules at base above and 

 below; fourth vein with rounded, oblique bend, then straight to 

 margin, joining the costa not very far before extreme apex of wing, 

 the distance being equal to half the length of the hind cross vein. 

 Calypters white. 



Length, 5.5 mm. 



Female : Front at vertex 0.25 of head width, widening very little 

 until close to antennae; pollen of front distinctly yellowish; para- 

 frontals wider than in male but parafacials not. Outer verticals 

 not half as long as inner; ocellars smaller than in male; third anten- 

 nal joint slightly shorter, not quite twice the second. Dorsal bristles 

 of abdomen as in male but less strong, no erect hairs along median 

 line. The stubby bristles of venter, mentioned in diagnosis, may be 

 very striking if the venter happened to dry with protruding keel, 

 or may be difficult to see if the keel is completely flattened down. 

 The length of the fourth segment below is considerablj^ longer than 

 that of the two preceding segments combined. 



Length, 4.4 mm. 



rype.— Male, U.S.N.M. No. 43589. 



Remarks. — The foregoing description is based on the type and 

 allotype. Most of the other females do not show the yellow tinge 

 to the parafrontal pollen. A few of the numerous females lack the 

 pair of discals on the second segment. Several males have a dis- 

 tinct brownish tinge on the wings and calypters. 



Described from the following material (all paratypes except the 

 first two) : 



(a) Type, allotype, one additional male and two females, reared 

 from Chelymorpha cassidea Fabric! us, at Chicopee, Mass., by 

 George Dimmock (Dimmock No. 2075). 

 (6) One male and one female, reared from the same host in 1900, at 

 Springfield, Mass., by Dimmock (Dimmock No. 1C71). 



(c) Two males and two females, reared from the same host in New 

 Hampshire by workers of the Gipsy Moth Laboratory (G. M. L. 

 No. 12172). 



(d) One male, one female, reared from the same host in 1900, at 

 Chicopee, Mass., by F. Knab. 



(e) One male, Hatch Experiment Station of Massachusetts, with 

 label, "Parasite on Lady-bird." The host larva was probably 

 the same as preceding, which might easily be mistaken for a 

 coccinellid. The date is August 10, 1895. 



(/) One female, reared from the same host as type, at Cedar Keys^. 

 Fla., by Hubbard and Schwarz, May 6, 1875. 



