WILLIAM J. FOX. 5 



terminates before the anterior ocelli: clypeus siibconvex. rather suddenly short- 

 ened, and bidentate medially ou anterior margin ; each ocellus bounded outwardly 

 by a strong pit or groove, the space between hind pair greater than that between 

 them and eyes; antennae short and robust, first joint of flagellum longer than 

 second, the scape not as long as the three following joints united ; dorsulum and 

 scutellum with strong, separated punctures, those ou mesopleurse feebler; middle 

 segment with a series of parallel strong folds from side to side, interrupted in the 

 middle, however, by a broad furrow, which has transverse folds and runs gradu- 

 ally narrowing, nearly to the apex, the remainder of middle segment coarsely 

 and irregularly rugose; legs clothed with fine hairs, hut not spinose ; abdomen 

 shining, petiole as long as hind femora, narrowed from base to middle, above 

 shining, with a single furrow on basal half; pygidium small, not distinctly mar- 

 gined laterally; wings subhyaline, iridescent, nervures dark, second recurrent 

 vein received by the third submarginal cell. Black; ilagellum beneath, tegulte 

 tarsi and fore tibise anteriorly, testaceous ; face and tront with silvery pubescence ; 

 head and thorax with short, pale fuscous pubescence. Length 6-7 mm. 



Utah ; Las Cruces, New Mexico (Cockerel! ). 



2. Psen trisiilciis n. sp. 



? Psen leucopns Packard (nori Say), Pr. Ent. Soc. Phil. vi. 399 (in pt.), 9 . 1867. 

 9 . — Head with distinct, separated punctures, less strong than in frontalis ; front 

 similarly produced ; clypeus flat, strongly bidentate; ocelli with a feeble furrow 

 on each side, space between hind pair somewhat greater than that between them 

 and eyes; antennse slenderer than in frontalis, the first joint of flagellum scarcely 

 longer than second, the scape longer than the three following joints united ; dor- 

 sulum finely striated apically: middle segment as in frontalis, but the medial 

 furrow shorter; abdomen shining, petiole shorter than hind femora, above 

 strongly trisulcate. Otherwise as in frontalis. Length 7 mm. 



New Hampshire. One specimen. This is probably the species 

 described by Packard as the female of leucopus Say, which it is not. 



2. Group nlger. 

 Pygidium ( 9 ) narrowed and acute at apex, margined laterally 

 and covered with distinct, separated punctures. Petiole trisulcate 

 above. Antennre ( S ) long and slender, not at all clavate, the fla- 

 gellum in both sexes, as a rule, never very pale beneath. Recurrent 

 veins both received by second submarginal cell. Cubital vein of 

 hind wings originating distinctly before apex of submedian cell. 

 Front at most sending off a slender carina which runs to or near the 

 anterior ocellus. Tibiae spinose. 



.3. Pseii cylindricus n. sp. 



9. — Head with strong, separated punctures, closest on front and occiput, 

 where, in addition, there are some fine stri« ; face and clypeus with dense silvery 

 l)ubescen(;e, the clypeus obtusely bidentate in the middle of anterior margin : 

 space between hind ocelli distinctly less than that between them and eyes, the 

 hind pair connected by a strong furrow which bounds them posteriorly ; the head 

 behind them somewhat raised ; antenna' clavate, tolerably slender, the first joint 



TRANS. AM. ENT. SOC. XXV. JANUARY, 1898. 



