208 MEMOIRS ON THE COLEOPTERA 



Goniusa Csy. 



The species Euryusa obtusa, of LeConte, upon which this genus 

 is founded, is very widely distributed in the nearctic regions, 

 Mr. Criddle having recently sent me a male from Aweme, Manitoba, 

 which appears to be perfectly similar to those in my collection taken 

 in the District of Columbia. This extended range is parallel to that 

 of the Paederid Megastilicus formicarius Csy., of which Mr. Criddle 

 also sends me an example from Aweme, not differing in any way from 

 those taken by Mr. Blanchard in Massachusetts. 



Thecturota Csy. 



Oligurota Csy. 



This genus of minute and extremely slender species is allied to 

 Thectura. I have confirmed the original count of four joints in 

 the middle tarsi by the renewed examination of many examples 

 and there can be no doubt that the genus is Bolitocharid, though 

 resembling at first sight some of the minute species of Hydrosmecta, 

 recently separated by Ganglbauer under the name Hydrosmectina. 

 The species recently described by Bernhauer under the name 

 Hydrosmectina subtilior, is evidently a Thecturota, as in fact is 

 conclusively proven by an actual specimen in my possession, col- 

 lected at Pasadena, Cal. The remarkable transverse fossa at the 

 middle of the base of the occiput is one of the most important generic 

 characters of Thecturota, and has been developed to receive the 

 anterior tip of the prothorax when the head is thrown upward, a 

 manoeuvre which is evidently practiced by the insect, as shown by 

 the condition of a number of dried specimens before me. 



The genus Thecturota is a large one and is distributed over the 

 entire nearctic region of North America; the following are some 

 additional species: 



Thecturota laticeps n. sp. Very slender, parallel, feebly convex, 

 slightly shining, blackish-piceous, the pronotum and elytra paler; head 

 large, not at all longer than wide, fully as wide as the prothorax, feebly 

 inflated at base, the eyes small and anterior, slightly prominent; surface 

 minutely and rather strongly sculptured, especially toward and on 

 the sides, the front with a small feeble elongate impression, just before 

 the middle; antennae rather short, as long as the head and prothorax, 

 blackish throughout, sometimes wholly pale from immaturity, gradually 

 distinctly incrassate distally, the first joint nearly as long as the next 



