126 NORTH AMERICAN 



much shorter than the last ; middle coxae widely separated by the meso- 

 sternum which has between them a broadly Innate area abruptly declivous 

 along its posterior arcnate edge and feebly produced in the middle, bearing 

 on its face a transverse arcuate row of setae. 



Male. — Sixth ventral segment broadly and feebly sinuate at tip, sinus 

 feeble, evenly rounded, about ten times as wide as deep. 



Female. — Prothorax slightly wider than the head ; sixth ventral segment 

 very broadly and evenly rounded behind. 



Length 7.5-8.0 mm. 



Arizona (IMorrison), 2. 



Tlie description is drawn from the male ; the species bears a great 

 resemblance to Philonthus or Actobius, but appears to me to belong 

 to Belonuchus on account of the spines along the inner edge of the 

 anterior femora. 



XAIVTHOLINUS Serv. 



X. f IICOSIIS n. sp. — Form very slender ; pubescence pale, short, very 

 sparse, erect and setiform ; head black above and beneath, oral organs and 

 antennae dark rufous ; pronotum pale reddish-testaceous ; elytra very dark 

 testaceo-piceous ; abdomen above darker than the elytra, very dark piceous- 

 brown, beneath slightly paler. Head very long and narrow, one-half longer 

 than wide, sides nearly parallel, very feebly swollen behind the eyes ; basal 

 angles rather narrowly rounded ; base transverse ; eyes very small, circular, 

 not prominent, nearly touching the base of the mandibles, nearly three times 

 their length from the basal angles ; interocular surface strongly and cyliu- 

 drically convex, polished, broadly impnnctate along the middle, and narrowly 

 impunctate in a slightly oblique line from the eyes to the basal angles on 

 the sides, elsewhere above coarsely and rather loosely punctate, punctures 

 strongly elongate ; beneath more finely aud remotely punctate, punctures 

 nearly round ; fourth joint of the maxillary palpi much longer than the third, 

 third finely acuminate, swollen slightly toward base ; antennae scarcely 

 longer than the head, basal joint distinctly longer than the next four 

 together, more than four times as long as wide, rather strongly arcuate 

 downward, second slightly longer than wide and slightly narrower than the 

 first, third and fourth sub-globular, slightly narrower than the second, joints 

 fivi! to ten increasing in width, nearly equal in length, the former very 

 slightly wider than long, the latter nearly twice as wide as long, eleventh 

 as wide as the tenth, slightly longer than wide, very obtusely conoidal, joints 

 one to three glabrous, coarsely and sparsely setose, remainder very finely 

 and densely pubescent, pubescence very short ; neck narrow, swollen. Pro- 

 thorax about equal in width to the head, shorter than the same, about one- 

 third longer than wide ; sides very feebly convergent posteriorly and very 

 feebly arcuate from above, sinuate laterally ; apex sligiitly longer than the 

 base, broadly triangular; apex truncate at the junction of the neck, base 

 broadly arcuate ; basal angles rather broadly rounded, apical less broadly 

 so ; disk polished, having a very irregular line of six punctures exclusive of 

 the minute basal one, and a lateral discal row of four near the middle ; very 



