208 CALIFORNIA ACADEMY OF SCIENCES. [52] 



very slender, first joint longer than the next three together, as long as the last 

 three. Length 1.8 mm. 



California; (San Mateo 1). Mr. C. Fuehs. 



The type of this interesting species is probably a male. 

 The tarsi are very remarkable; the anterior are irregular, 

 attached obliquely to the tibia3, and have the basal joint 

 large, broadly dilated and slightly darker in color; the next 

 three joints are very small, emarginate at tip, pale flavo- 

 testaceous in color, and moderately dilated, successively 

 less strongly so; the fifth slender. The intermediate tarsi 

 are irregular and are very distinctly dilated toward base; 

 both the anterior and middle tarsi are densely clothed be- 

 neath with very slender papillse, and are verticillate at the 

 sides; the papillae beneath are sometimes terminated by 

 very minute enlargements which are apparently composed 

 of a viscid substance, and analogous to the erect setae ob- 

 served upon the under surface of the head in the Euplectini 

 of the Pselaphidae. The claws are very small. There 

 are no sexual characters of importance observable at the 

 abdominal vertex. 



HETEROTHOPS Steph. 



H, exilis u- sp. — Form very slender, rather convex; pale reddish-testa- 

 ceous throughout; head slightly darker, more castaneous; antennas and legs 

 slightly paler, pale flavate; integuments polished; head andpronotum glabrous; 

 elytra and abdomen finely and rather densely pubescent, the elytra the more 

 sparsely so. Head rather strongly deflexed, oblong, abruptly and feebly con- 

 stricted at the neck; sides thence to the eyes feebly convergent, feebly arcu- 

 ate, twice as long as the eyes which are small, not at all prominent and almost 

 at the apical angles; surface transversely and rather strongly convex, impunc- 

 tate, finely and excessively feebly strigose; antennas inserted at a very short 

 distance from the eyes, shorter than the head and prothorax together; feebly 

 incrassate; first joint as long as the next two together, third small, much 

 shorter than the second, slightly longer than wide, tenth distinctly wider than 

 long, eleventh slightly longer than the two preceding together. Prothorax 

 scarcely longer, and, at the apex very slightly wider than the head, widest at 

 the base where it is but very slightly wider than long; sides convergent from 

 base to apex, broadly, evenly and distinctly arcuate; apex broadly and very 

 feebly arcuate, three-fourths as wide as the base; the latter evenly and very 



