No. 22,] HYMENOPTERA OF CONNECTICUT. 609 



Base of scutellum with a transverse groove; no parapsidal 

 furrows 16 



16. Metathorax with one longitudinal carina. .Neoscleroderma p. 610 

 Metathorax with three longitudinal carinae Holepyris p. 611 



17. Metathorax extending anteriorly between lobes of meso- 



thorax as far as their middle ; 18 



Methathorax inserted behind mesothorax, between lobes of 

 which it does not extend forward. .Pseudisobrachium p. 609 



18. Metathorax feebly contracted near middle, its base as wide 



as its apex Apenesia p. 610 



Metathorax contracted at or near base ..Pristocera p. 609 



Pristocera Klug. 



Only a single species occurs within the state. 



P. armifera Say. 



Male black, shining, coarsely punctate; wings f usco-hyaline ; 

 abdomen short, ovate, shining. Female ant-like, reddish brown, 

 the abdomen paler. Length : male, 7-8 mm. ; female, 4 mm. 



Kent, 31 August, 1904 (W. E. B.) ; Rockville, 25 August, 

 1904 (H. L. v.). 



Pseudisobrachium Kieffer. 

 The slender legs, absence of malar space and 4-jointed 

 labial palpi distinguish the males from Epyris, and the 

 strangulated thorax makes the females readily recognizable. 



Key to Species. 



Males. 



1. Wings tinged with fuscous 2 



Wings hyaline rufiventre 



2. Mandibles with small teeth within myrmecophilum 



Mandibles large and broad, without teeth within . . . mandibulare 



Females. 



1. Abdomen not longer than thorax myrmecophilum 



Abdomen much longer than head and thorax united 2 



2. Antennae nearly twice the length of head mandibulare 



Antennae only one and one-half times the length of head . i . . 



rufiventre 



°P. rufiventre Ashmead. 



Male: head and thorax black, shining, abdomen rufous; 

 legs, including coxae, pale; antennae reddish. Female: head 

 blackish ; thorax brown ; legs, antennae, and abdomen brownish 

 yellow. Length 3.5-4 mm. 

 39 



