62 CALIFORNIA ACADEMY OF SCIENCES. 



Female: Form and color as in male. Labrnm project- 

 ing, rugose, covering the mandibles. Head; clypeal mar- 

 gin raised; a feeble tubercle just in front of the clypeal 

 suture, immediately behind which is a central trans- 

 verse ridge, undivided, slightly higher in the middle and 

 slightly apiculate at either end. Antenna9 less robust 

 than in the male. Thorax: very convex, shining; out- 

 line obtusely triangular; anterior margin seen from 

 FEMALE. above, truncate in the centre; angles j^roduced; sides 



rounded; posterior margin much produced to meet the scutellum, sinuate 

 toward the angles which are rounded; the front discal area characterized by 

 a bi-lobed transverse riised line at either enl of which, outward and for- 

 ward, is a well formed but depressed tubercle; behind which line the disc is 

 dense with coarse corrugated punctures, which become scattered and plain, 

 nowhere reaching the posterior margin, but taking a transverse course, 

 barely reach the side margins, where they become less distinct. Elytra: 

 much the same as in the male, but the interstices of the fourteen punctate 

 striae a tdfle more wrinkled and much more convex. Length, smaller than 

 the male. 



Habitat: burrowing in the ground near the city of Sonora, Tuolumne Co., 

 Cal.; found also in Sacramento Co. 



The name selected for this species is intended to be a slight tribute of hon" 

 or to Dr. Geo. H. Horn, the emiaent Coleopterist, as a slight return for 

 many favors. 



STRIDULATINa ORGANS. 



Chas. Fiichs, Esq., having obtained living specimens of 

 the above new species of Bradjcinetas discovered thit it pos- 

 sessed the power of stridulating. His researches through 

 coleopterological literature disclose nothing relative to the 

 stridulating faculty in this genus. The latest work on class- 

 ification, that of L3 Conte and Horn, makes no mention of 

 it, and as these able authors always notice such biologic 

 characters when aware of them, it is safe to affirm that the 

 observations of Mr. Fuchs are new, and that to him belongs 

 the credit of the discovery of these particulars. 



The anatomical investigation by Mr. Fuchs of 

 this beetle discloses the stridulating apparatus to 

 be well developed, and to consist of three trans- 

 verse bands situated respectively upon the fourth, fifth and 



