MONOGRAPH OF THE NORTH AMERIOAN morTOTRYPTD.E, 313 



two deep elongated foveola' at base, the spaee between tlieiii sliowinpf 

 some loiigitiuliiial stiiie, of "rwise tlie whole surface is highly polished, 

 black. 



Habitat. — District of C«)luiiibia. 



Types in National Museum. 



Described from several specimens bred by Dr. llilcv from the Oypress 

 Cecidomyiid {CecUlomy'm c. aiutimfixd Kiley) ; no <late of rearing is given. 



Polygnotus viticola, sp. nov. 



S 9. Length, 1.20 to 1.40"". Black, polishe<l; head a litth' more 

 than thrice as wide as long antero jjosteriorly, the vortex posteriorly 

 transversely aciculated, the face smooth. Mandibles rufous. Antenna? 

 10-jointed, brown or brown-black, the Hagellum not quite twice as long 

 as the scape ; pedi<'cl hardly as long as the tirst and second funiclar joints 

 tf)gether and not as thick at tij) as the second funiclar joint; tirst funi- 

 clar joint minute, the second and third about of an equal length, but the 

 second the thicker; club o-jointed, the joints bricily pedicellate, the 

 tirst four joints as wide as long, cuj) shaped, the last cone-shaped, 

 longer than the penultimate. 



In the S the tlagellum is covered witli short, white, stiff" hairs; the 

 second funiclar joint is larger and stouter than thejiedicel; the club 

 (5-jointed, the joints, except the last, oval inoniliform, pedicclhited, the 

 last cone-shaped, one and one half times as long as the penultimate 

 Thorax ovoid, i)olished, the mesonotal furrows very faintly indicated 

 l>osteriorly, more distinct in the female, tlie basal point of the middle 

 lobe projecting slightly upon the scutellum, the lateral lobes at base 

 slightly pubescent. Scutellum transverse, high, convex, very sjtarsely 

 pubescent. Metapleura sericeous. Teguhe rufo-piceous. Wings hya- 

 line, pubescent. Legs, including coxa), rufo-piceous or brownish, the 

 tarsi paler, or yellowish. Abdomen ovate, scarcely longer than the 

 hea<l and thorax together, i)ointcd at tip, the petiole striated, the sec- 

 ond segment Avith two long, striat<Hl foveola; at base, one on either side, 

 the third and fourth, with a transverse row of faint punctures, the fifth 

 and foHowing segments closely pun(!tate; the third, fourth, and tifth 

 ventral segments also show rows of punctures. In the; S the abdomen 

 is shorter, oblong-oval, the third, fourth, tifth, ami sixth segments with 

 a single row of punctures at base, whiU^ tin; col•r(^sponding ventral s«'g- 

 ments show rows of very faint i)unctures. 



Habitat. — Washington, D. C. 



Types in Nathmal INIuseum. 



Described from several specimens, reare«l March 31, 1SS2, from aCeci 

 domyiid gall on the petiole of a grapevine, collected on the grounds of 

 the Department of Agriculture. 



