BYRRHID/E 17 



Fossae still deeper and much more abruptly formed, defined by an ele- 

 vated bead-like margin; upper surface always bristling with short 

 erect clavate or squamiform setae; size small to minute 3 



2 Tibiae more slender, nearly straight, obliquely truncate externally at 

 apex; abdominal segments finely, densely chagrined and opaque 

 laterally and along their apices; vertex unmodified. [Type B. 

 sericeus Forster]. Subarctic of the northern hemisphere. .. Cytilus 



Tibiae broader, more flattened, always evenly rounded externally through- 

 out their length; abdominal segments never finely chagrined at any 

 part of the surface; vertex generally with a short transverse line at 

 the middle, immediately behind which there are two small pale 

 ocellae-like spots. [Type B. fasciatus Forster]. Subarctic of the 

 northern hemisphere Byrrhus 



3 F.lytral striae extremely fine and scratch-like; epipleura anteriorly 

 very narrow and ill-defined. [Type B. nniriniis Fabr.]. Palaearctic 

 and nearctic Porcinolus 



Flytral striae less fine and always punctate; sometimes consisting simply 

 of series of detached punctures 4 



4 Epipleura anteriorly very narrow and not well defined; sculpture 

 dense, at least beneath 5 



Epipleura anteriorly broad and well defined along the metasternum; 

 sculpture sparse throughout; size more minute 6 



5 Antennae very gradually enlarged distally; sculpture of the elytra 

 somewhat as in Cytilus, the intervals alternating somewhat in ele- 

 vation; scutellum well developed. [Type assumed C. crichsoni 

 Reitt.]. Palaearctic *Curimus 



Antennae with a 3-jointed club, which is not abruptly formed but rather 

 gradual; elytral striae generally less groove-like and tending to be 

 represented by series of shallow irregular punctures, the intervals 

 all flat and equal; scutellum minute; clavate seta? more linear in 

 arrangement; body of much smaller size. [Type B. striatopiinctata 

 Steff.]. Palaearctic and nearctic Curimopsis 



6 Elytral striae replaced by unimpressed series of shallow detached 

 punctures; integuments virtually glabrous; scutellum very small; 

 clavate setae forming even single series. [Type 5. spinosa Rossi]. 

 Palaearctic *Syncalypta 



We have no exclusively American genus in this tribe so far as 

 discovered, but Curimus Er., and Syncalypta Steph., as well as 

 the subgenus Seminolus Muls., differing from Byrrhus in the broader 

 body and longer antennae, seem to be confined to the European 

 fauna, the species which we have assigned to Syncalypta forming 

 part of the closely allied Curimopsis Gangl. My single example of 

 the very small Syncalypta spinosa is closely retracted, so that I 

 cannot describe the antennae. 



T. L. Casey, Mem. Col. Ill, Feb. 1912. 



