(Page 121) 



The head rnther broad, yet narrower than pronotum, convex, very finely 

 and densely punctated, glistenin^i; antennae rather thin, scarcely thicken- 

 ed distally, their third joint about as long as the second, the middle ones 

 fully as long as broad, the next-last feebly transverse, distal joint more 

 than twice as long as the tenth, tapering. Pronotum scarcely twice as broad 

 as lonj, posteriorly almost as broad as elytra, anteriorly feebly rounded 

 narrowing, its hind corners almost rectangular and posterior margin Inside 

 them feebly cucvad , dorsum feebly convex, rather finely, very densely punc- 

 tated, almost na^ed, with a sharp entire groove in medial line, the sides 

 without distinct bristles; elytra '/j longer than pronotum, with particular- 

 ly dense and rather fine scabrous punctation, their posterior margin inside 

 the outer corners distinctly curvea ; abdomen tapering, all over with very 

 fine, anteriorly dense, posteriorly more isolated punctation, somewhat long 

 and sparse hair vestiture. L. 6 mm. 



In the O the abdominal next-last ventral jOint soraewhat elongate and 

 more narrowing than in the p , 



It lives in the mound with Formica rufa and its races, pratensis and 

 truncicola , and is not rare; occasionally also found with Form. ex:becta 

 and Lacius f uli-.-inosu3 . Distributed in Middle and I>'orth Europe. 



In Sweden is found (teste Thomson) in bumblebees' nests a very closely 

 allied species, H. nidorum Thorns, .which is light Lrov.n and without groove 

 on pronotum. Possibly this species or form may bo found here also, in humble- 

 bee^' nests. 



4. Subgenus Coprothassa Thoms. 

 6. II. sordida I*arsh. 



-204- 



