202 Trans. Acad. Sci. of St. Louis. 



form and sculpture, the antennae slender and only just visibly iucras- 

 sate distally ; prothorax obviously narrower than the head and distinctly 

 longer than wide, the nearly straight sides just perceptibly converging 

 from the broadly and obtusely rounded anterior angles — at apical 

 fourth or fifth — to the base; elytra convex, polished, finely, sparsely 

 punctured, only very slightly longer than wide, not quite one-half 

 wider and only about a fourth longer than the prothorax; gular sutures 

 subobliterated. Male with the fifth segment wholly unimpressed, the 

 apex broadly, feebly sinuato-truncate ; sixth segment with a rounded 

 sinus between two and three times as wide as deep, the adjoining 

 surface feebly impressed in the middle, the impression gradually 

 evanescent anteriorly. Length 3.0 mm.; width 0.5 mm. California 

 (Dunsmuir), — Mr. Wickham cervicnla a. sp. 



Fifth segment of the male lobed in the middle at apex and longitudinally 

 impressed, the impression longitudinally divided at base by a short 

 median raised line and becoming posteriorly a spoon-shaped depression, 

 limited at the sides by acutely elevated folds; sixth ventral with a deep 

 oblong-elliptical emargination, which is widest at the middle of its 

 depth, the surface in front of the emargination with a triangular impres- 

 sion having abruptly limited side margins; hind femora stouter than 

 usual and fully as broad as the anterior. California (Marin Co.). 



femoratus Fall 



I am obliged to place femoratus at the end of the table, as 

 no characters are given under the original description enabling 

 me to coordinate it with the other species. Its sexual charac- 

 ters are so distinct that there will be no trouble in identify- 

 ing the male if found. Robustulus closely resembles punctatus 

 but is larger and stouter and has the legs notably stouter. A 

 specimen from Truckee, before me, may possibly represent 

 the montanus, of Fall, but it seems to be rather smaller, being 

 2.8 by 0.55 mm. in size, the prothorax obviously narrower 

 than the head, although less so than in most of the species, 

 and the triangular notch of the sixth segment is wider than 

 deep, with its anterior angle well rounded, the transversely 

 rounded part being about a fourth as wide as the entire notch. 

 Pallidas has male sexual characters greatly resembling those 

 of punctatus, but the less abruptly truncate lobe of the sixth 

 segment is relatively still larger, being nearly a third as wide 

 as the segment and the gular sutures are more widely sepa- 

 rated; these characters, in conjunction with the smaller size 

 and different coloration, will readily distinguish the two 



