HENRY L. VIERECK. 177 



coidal cell with a whitish spot contiguous with the cubitus and recurrent neiv- 

 ure at their junction, first discoidal cell with a short petiole not longer than the 

 pedicellum, recurrent nervure received by the cubitus a little before the first 

 transverse cubitus^altnost interstitial, first abcissa of the radius a little less than 

 half the length of the second abcissa, which latter is about twice the length of 

 the first or second transverse cubitus. 



Abdomen. — Chiefly smooth and polished, the second segment with the triangu- 

 lar raised space having a very acute apical angle that almost attains the posterior 

 margin, on each side of this triangular area the abdomen is for a short distance 

 somewhat wrinkled ; ovipositor about 2 mm. longer than the head, thorax and 

 abdomen together. 



Black ; abdomen rather ferruginous, ovipositor brown, sheaths thereof black. 



% .—7 mm. — Differs from the female in having the second segment of the abdo- 

 men more wrinkled, with the wrinkles forming strise, the first segment as in the 

 female, rather striate. 



Type. — University of Kansas. 



Type locality, Douglas Co., Kansas. 



One paratype from the type locality, differing only in the length 

 which is 7 mm. 



These specimens were collected on elm trees, where the females 

 were caught in the act of ovipositing through the bark infested with 

 beetles. 



Diiiotrema siguifrons n. sp. 



Derives its name from an elongate medial oval convex elevation 

 on the face extending from the antennal fovea to about halfway 

 down the face. 



%. — 2.5 mm. — Head. — Black, smooth and highly polished; clypeus almost 

 similunar, convex and smooth, with an entire rounded edge; mandikles pale 

 brown, the teeth with blackish edges, tridentate, the teeth subequal, the largest 

 tooth, which is rather blunt, being on the upper margin, the middle tooth very 

 sharp, the lower tooth shortest and rather blunt; antennae twenty-four jointed, 

 the scape and pedicellum pale, testaceous, as is the basal portion of the first joint 

 of the flagellum, the joints subequal and very dark brown, the first joint dis- 

 tinctly but only a little longer than the second. 



Thorax. — Black, smooth and polished in the same way as the head ; the meso- 

 pleura divided transversely by a crenulate groove nearly as long as the tergite ; 

 metauotum almost uniformly rugulose, the pleura of the metathorax smooth and 

 polished ; wings hyaline, tlie nervnres testaceous, rather tinted with fuscous, the 

 stigma and costal margin darker than the remaining nervures ; second submar- 

 ginal cell pentangular, the second abcissa of the cubitus, which is about half the 

 length of the second transverse cubitus, making a right angle with the third 

 abcissa, posterior wings with the submedian cell a little more than half the length 

 of the median cell ; legs uniformly testaceous, the claws brown. 



Abdomen.^Chie&y black, the first segment reddish testaceous, rather dullish 



TRANS. AM. ENT. ?^C. XXXII. (23) JUNE. 1906. 



