*°889. n J PKOCEEDINGS OF THE NATIONAL MUSEUM. 419 



Antenna? black (broken); palpi and tips of mandibles yellowish; 

 mesopleura impressed at the middle, the metathorax areolated, the 

 spiracles round; legs yellow-ferruginous, all the coxa? and the first 

 joint of posterior trochanters black, the claws pectinate ; abdomen 

 shining, alutaceous ; the petiole expanded and curved at apex, the 

 spiracles small, round, placed behind the middle and on about the 

 middle of the expanded part; wings hyaline, iridescent; stigma pale 

 brown, the veins piceous black, the areolet entirely wanting. 



Habitat— West Cliff, Custer County, Colorado. 



Described from one specimen, received from Mr. T. D. A. Cockerell. 



The position assigned this insect is uncertain; it may belong to the 

 Tryphonince on account of the pectinated claws. My reason for placing 

 it here is, that it has a distinct ovipositor and the spiracles of the ab- 

 dominal petiole are behind the middle and nearer to each other than to 

 the apex, and, except in the pectinate claws, it agrees with the defini- 

 tion of this genus. The pectinate claws seem to ally it to the Try- 

 phonid genus Ctenopelma. 



CATALYTUS Forster. 

 Catalytus pallipes sp. uov. 



Male and Female. — Length, 3 mm ; ovipositor very slightly exserted. 

 Black, polished, sparsely pubescent. The antenna? are filiform, 16 jointed 

 in the female, 14-jointed in the male, brown, the two basal joints pale, 

 especially beueath, the third joint is the longest. Palpi, clypeus, face, 

 and orbits to middle of forehead, testaceous. Thorax with indications 

 of parapsidal grooves anteriorly ; pleurae smooth ; metathorax very 

 short, polished, without any keels, excepting a slight one separating 

 the metapleura. the spiracles round. 



Legs, including coxa?, pale-yellow testaceous ; the posterior tibia? are 

 thickened and contrast with the slender anterior and middle pairs, the- 

 tibial spurs minute, the tarsi not longer than the tibia?. 



Abdomen oval, black, polished, the venter and the extreme apex tes- 

 taceous, the petiole from the base is gradually broadly dilated to apex, 

 with a depression on each side, the spiracles are small, placed a little be 

 hind the middle, but on account of the width of the petiole are wider 

 apart than they are to the apex. Wings hyaline, iridescent, tegula? yel- 

 low; stigma and veins brown; the areolet is pentagonal in position but 

 open along the outer side ; the submedian cell is longer than the median, 

 the cubitus being slightly bent in the middle. 



Habitat. — Georgetown, D. C. 



Described from (J specimens — 1 male, 5 females, of which the follow- 

 ing is recorded in tbe note-book of the Department by Mr. Pergaude : 



Found near the Aqueduct Bridge, Georgetown, D. C, on May 19, 1881, two saw- 

 fly larvae which were infested with parasitic larvae; they fed on the saw-fly larvae 

 externally in the same manner as Eupleotrus larvae, but were not clustered iu a group 

 like the latter. 



