OF WASHINGTON, VOLUME XIII, 1911. 125 



the abdomen with long white pubescence concealing the surface and 

 almost hiding the long lateral spines on the median segment; wings 

 whitish hyaline, iridescent; posterior tarsi much longer than their 

 tibiae. 



Measurements as follows: Total length 4.5 mm. ; of the thorax alone 

 0.49 mm.; of the abdomen alone 3.99 mm.; of the first segment of the 

 abdomen 0.41 mm.; of the second 0.1 mm.; of the third 0.73 mm.; of 

 the fourth 1.43 mm.; of the fifth 1.32 mm. 



Male. Scape a little shorter and less slender than in the female, 

 and first segment of the funicle a little shorter; parapsidal grooves a 

 little less distinct than in the female; abdomen not extending as far 

 as the apex of the hind wings, very acute, margined, five-segmented, 

 the first segment equaling the remainder taken together, smooth and 

 polished, the remainder minutely sculptured and opaque. Except in 

 these respects and in the measurements given below the male agrees 

 with the female. 



Measurements as follows: Total length 1.09 mm.; of the abdomen 

 0.49 mm. 



This species is described from females collected by Dr. A. 

 D. Hopkins at Tibb's Run, near Dellslow, West Virginia 

 (Hopkins West Va. No. 7070), and from males and females 

 collected by Prof. J. H. Comstock at Ithaca, New York. The 

 latter bear a number referring to the following note: 



Cornell University No. 683. Dolichotrypes hopkinsi Ashmead 

 (MSS.). Found in large numbers on a newly cut oak stump near Fall 

 Creek. Females were busily inserting the long part of the abdomen 

 into the intercellular spaces of the wood near the bark. They were 

 confined to the outer 2 inches of the wood. July 21st, 1897. Professor 

 J. H. Comstock collector. Named by Mr. W. H. Ashmead, who had 

 previously received it from Morgantown, West Va., supposed to have 

 been ovipositing in dipterous larvae in a stump. 



Professor C. R. Crosby informs us that he has taken addi- 

 tional specimens at Ithaca during the past summer (1910). 



Type: Female, U. S. Nat. Mus. Cat. No. 13829; male, in 

 the collection of Cornell University. 



Paralyses of each sex in each and in other institutions. 



The authors wish to express their indebtedness to Miss 

 Carol H. Bradley for the figures of the adults. 



DESCRIPTION OF PLATE VIII. 



Above, adult male. 



Below, adult female. 



Antenna of female, made with a camera lucida. 



