ART. 19 EEVISION OP THE TJSECHINI — BLAISDELL 9 



more finely punctured elsewhere, except on the basal segment; 

 impressions of the fifth only mdVierately marked. The first segment 

 is very broadly, feebly flattened at middle and between the coxae, 

 where the punctures are large, circular and shallow. The metaster- 

 nal surface between the four acetabula is distinctly and broadly 

 impressed with edges of the area slightly raised. 



Male. — Submentum with a spiculiferous puncture. Middle of the 

 ventral abdominal segments slightly but appreciably impressed, the 

 impressed area gradually diminishing in extent from the second 

 toward the fifth; the latter more strongly impressed and feebly 

 pitlike at the sides within the marginal bead. 



Female. — Submental puncture obsolete or minute. Middle third 

 of the first ventral segment impressed as in the male, the following 

 segments being evenly convex from side to side; the fifth more convex 

 at middle and less impressed as a whole within the thick marginal 

 bead, the lateral pitlike depressions being smaller but noticeable. 



Measurements. — Length 2.9-4.3 mm.; width 1.18-1.6 mm. 



Six specimens studied. Casey's types have been deposited in the 

 United States National Museum. Two of the four specimens 

 believed to be paratypes, given long ago by Col. T. Lincoln Casey 

 to Dr. E. A. Schwartz, were kindly transmitted to me for study and 

 contributed to the above revision of Casey's description. The type 

 has recently been examined by the author during a visit to the 

 Museum in Washington. Two other specimens from the same 

 museum are from Oregon (Linell collection) and the State of Wash- 

 ington (Morrison). The two other specimens were received as a 

 loan from Professor Beamer of the entomological department of the 

 University of Kansas. Casey writes that he had a large series before 

 him at the time he described the species, but I am informed that his 

 series now consists of 14 specimens, the labels of 3 of which indicate 

 "Hoopa Valley, Trinity River, Humboldt County (Fort Gaston)'' 

 (the type locality), 1 indicates Areata in the same county, and 10, 

 which he probably considered duplicates unworthy of complete 

 labels, bear only the State label "Cal." He overlooked the basal 

 elytral processes. Casey's type is illustrated by photograph. Plate 

 1, figure 1. 



In nucleatus all of the elytral intervals are more or less recognizable. 

 It has therefore served as a criterion for the determination of the 

 intervals in lacerta where part of the intervals are obsolete on account 

 of the closeness of the strial punctures. 



USECHIMORPHA, new genus 



Form subquadrato-oblong. Eyes deeply concealed in repose, 

 transverse, anterior and posterior borders parallel, quite straight and 

 not emarginate anteriorly, distinctly narrower than in UsecJius Mots- 



