M0N0C4RAPH OF THE NOllTH AMERICAN PROCTOTRYPID/E. 3()3 



usually alxjut halt' as loug; stigiual vein or first braucli of tlit" radius 

 sliii'litly obli(][ue. 



Abdomen conic-ovate, the tip with a slight upward curve, the petiole 

 as long- as, or a little longer than, the nietathorax, distinctly Huted or 

 striated; the third segment is short, but usually longer than the fourth. 



Legs much as in Cinetus, but with the tibial spurs distinct. 



This genus is at once recognized by the long falcate mandibles. 



The species known to me may be separated as follows: 



Head, thorax, aud petiole black. 

 Scape, pedicel, and legs yellow (? X. xantiiopus sp. nov. 



Head, except clypeus, black; tliorax and abdomen dull rufous. 

 AnteiiUiP and legs broAAailsli-yellow g X. mandibttlakis sp. nov. 



Brownish ; vertex and disk of thorax blackish 9 X . XANTiiorus. 



Xenotonia xanthopus, sp. nov. 



S . Length, 2.4™'". Polished l)lack, pubescent; the abdomen reddish- 

 brown; mandibles, palpi, two basal joints of antenui^^, and legs bright 

 yellow; tlagellum fuscous. Antenna^, 15-jointed, setaceous, the scape 

 very little longer than the first flagellar joint; the first flagellar joint 

 the longest, slightly excised at base, the joints beyond very slightly 

 shortening. Metathorax smooth, with a middle carina, the lateral carinte 

 irregular and broken, descending obliquely toward the posterior coxte. 

 Wings hyaline, the marginal cell fully two and a half times as long as 

 the marginal vein. Abdomen as long as the head and thorax together, 

 l»ilose beneath, the petiole a little longer than the metathorax with 

 raised lines. 



9. Length, .3'"'". Brownish, with a fuscous pubescence; vertex of 

 head and disk of thorax blackish; antenna', mandibles, i^alpi, and legs 

 yellow. Antenuie lo-jointed, filiform, a little shorter than the body; 

 scape more than thrice as long as the first flagellar joint; pedicel 

 rounded; first flagellar joint nearly thrice as long as the pedicel, the 

 joints beyond to sixth very gradually subequal, joints from sixth to last 

 hardly longer than thick. Abdomen a little longer than the head aud 

 thorax together, the petiole twice as long as the metathorax, fluted, the 

 third segment (me-third longer than the fourth, the second, with faint 

 punctures laterally otherwise it agrees with S . 



Habitat. — New Jersey. 



Types in Coll. Ashmead. 



Described from 1 S and 1 9 specimen. 



Xeuotoma niandibularis, sj). nov. 



(Rl. XIV, I^ig. 7, 9.) 



S 9. Length, 2.5""". Polished, pubescent; head black, the thorax 

 and abdomen varies from a blackish or brown to dull rufous, more 

 especially rufous in the S . Antenna' and legs pale brownish-yellow. 

 Mandibles long, sickle-shaped, crossing and extending far beyond each 

 other at tips. Eyes oval, vertical. Antenme in 9 Ll-jointed, filiform. 



