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bulletin: museum of comparative zoology. 



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Exochus captus, sp. nov. (Fig. 48.) 



Female. Length 6 mm. Dark colored, probably black, the apical part of 

 the abdomen brownish; legs apparently also dark. The insect from its im- 

 pression appears to have been very hard-bodied and highly polished, only 

 the mesonotum and the propleurae above showing a duller surface and faint 

 punctulation. Antennae not well preserved but apparently typical, the joints 



not far from the base of the 

 flagellum about quadrate in 

 shape ; those toward the apex 

 seemingly considerably 

 longer. Metathorax com- 

 pletely and very distinctly 

 areolated, the areas all 

 smooth and polished. Abdo- 

 men clavate, the carinae on 

 the petiole reaching to about 

 the middle of the segment, 

 the lateral pair somewhat 

 longer than the median ones. Second segment a trifle shorter than the 

 petiole, the others to the sixth growing very gradually shorter. Ovipositor 

 barely exserted. Wings hyaline, venation as usual in the genus, the stigma 

 and marginal cell narrow; second section of the radius three times as long as 

 the first; submedian cell much longer than the median. Legs very stout, the 

 hind tibiae with two spurs. 



One specimen seen in side view, well preserved and very character- 

 istic of the tribe Exochini, although its position in the typical genus is 

 not so certain. No. A48, type in the Amer. Mus. Nat. Hist. 



Tylecomnus Holmgren. 



Key to the Florissant species of Tylecomnus. 



1. Areolet open T. davisii, sp. nov. 



Areolet closed and petiolate . . . . T. pimploides, sp. nov. 



Fig. 48. — Exochus captus, sp. nov. Type. 



Tylecomnus davisii, sp. nov. 



'Female. Length 11.5 mm. Black or dark colored, including the legs. 

 Antennae brown; each abdominal segment with a broad pale band at the 

 apex. Head apparently smooth above and behind, but strongly punctate on 

 the face. Antennae setaceous, thick basally, the tips broken off with the 

 stone; first flagellar joint about twice as long as thick and as long as the 

 second and third together; second quadrate; third one-half longer than wide, 



