322 



PSYCHE. 



[September 1S92. 



Lhnulodes paradoxus is found here 

 with the same ant as the preceding spe- 

 cies though Mr. Schwarz takes it with 

 Lasius aphidicola. I once took a 

 specimen at Walnut, Ariz., with an- 

 other ant and it will probably be found 

 to infest the nests of several species. 



Trichopteryx parallelopipeda. A 

 specimen doubtfully referred to this 

 species occurred with ants (Tapinoma) 

 at Canon City, Colo. This is con- 

 trary to the usual habit in this genus 

 and is probably accidental. 



A species of Hetaerius taken by me 

 in Wyoming proves to be new, and as 

 it is very distinct and the species of the 

 genus are few, I describe it below to 

 preserve the record : 



Hetaerius hornii n. sp. Form robust, 

 broadly sub-oval, color rufo-castaneous ; sur- 

 face shining sparsely covered with yellow 

 scale-like hairs, longer on the sides and near 

 base of the pronotum. Head with rather 

 large tolerably dense punctures, front con- 

 cave. Thorax broader than long, wider at 

 base than at apex ; divided on each side by a 

 deep groove which is double at the base, into 

 lateral and discal portions : discal portion 

 shining, with a few punctures and clothed with 

 yellow recumbent hairs, sparse at the middle 

 but more numerous on the sides and especially 

 at base where they are also much longer; 

 lateral portion divided again by a deep groove 

 about 1-3 from base of thorax into anterior 

 and posterior divisions, the latter being sub- 

 quadrate, convex, somewhat shining, finely 

 punctured and covered with long yellow hair; 

 the anterior division is irregularly oblong, 

 wider in front, flattened, and, where the ab- 

 sence of hairs permits the surface to be seen, 

 somewhat scabrous; it is clothed with yellow 

 hairs which become longer behind. Elytra 

 with the striae deep at base, each having the 



outer margin raised, subhumeral stria reach- 

 ing about two-thirds to tip. first and third 

 dorsals entire, the tips converging, second a 

 little shorter. The raised edge of each stria 

 bears yellow recumbent hairs, longer on the 

 first and third dorsals; between the inner 

 dorsal and the suture are two rows of hairs 

 following the course of lines of indistinct 

 punctures. Propygidium with but few punc- 

 tures visible under low power, but with 

 higher power it is seen to be densely and 

 finely rugose ; pygidium much the same but 

 with still finer punctures, mostly towards the 

 sides; margins of propygidium and pygidium 

 dark. Presternum punctured, margined at 

 sides, truncate at base, lobe with a moderate 

 constriction anteriorly, extremity somewhat 

 rounded; prosternal ridges extending two 

 thirds towards apex, nearly parallel, merely 

 slightly sinuate opposite the coxae. Meso- 

 sternum punctured, with distinct marginal 

 line. Metasternum and abdomen smooth, 

 shining. Length 2.5 mm. 



Differs from H. tristriatus, to which 

 it is nearest allied, in the sculpture of 

 the thorax and in vestiture ; the form of 

 the lobe at the posterior angles of the 

 thorax is globular in that species. 



Taken by me at Cheyenne. Wyoming 

 in the nests of Formica scliauftissi 

 Mayr, in May 1889. Type in cabinet 

 of Dr. Horn to whom it gives me 

 pleasure to dedicate it in recognition of 

 many favors rendered. 



Rhyssemus sonatus occurred with 

 Solenopsis debilis at Canon City, Colo., 

 but this may be merely accidental as is 

 often the case with Aphodius granarius 

 which I find in the ant's nest here. 



When the habits of our western spe- 

 cies of Tenebrionidae are better known, 

 I think it will be found that they fur- 



