86 GEO. H. HORN, M. D. 



SANDALUS Knoch. 

 Four species are known to occur in our fauna which may be dis- 

 tinguished in the following manner : 



Tarsi broad and flat, the joints deeply emarginate, the lamellae long and very- 

 distinct. 

 Thorax obtusely subangulate behind the middle. PI. II, figs. 12 — 13. 



petrophyus Knoch. 

 Thorax regularly conical. 



Thorax densely punctured and op.aque with numerous large punctures inter- 

 mixed porosus Lee. 



Thorax finely punctulate and somewhat shining with very few coarser punc- 

 tures intermixed niger Knoch. 



Tarsi rather slender, the joints feebly emarginate, the lamellfe small and in- 

 . conspicuous. 

 Thorax as in niger. PL II, figs. 10—11 califoriliciis Lee. 



The sculpture of all the species is similar, the head densely and 

 coarsely punctured, thorax densely punctured with coarser punctures 

 intermixed, the latter less evident in niger. The elytra are densely 

 coarsely punctured, the punctures arranged in irregular rows, and on 

 the disc are often three faint costae. 



In general form the last three species of the above table are quite 

 similar as shown on PI. II, figs. 10 — 11. S. petrophi/us however is 

 diiferent in outline as shown in figs. 12 — 13. 



In color they vary in the species from castaneous to nearly black, 

 specimens occasionally occurring with the elytra testaceous. The an- 

 tennal flabellum of the male usually piceous is sometimes reddish. 



JS. petrophyus Knoch, occurs from Pennsylvania to Illinois. 



«S^. porosus Lee, Texas and New Mexico. 



S. niger Knoch, Middle States to Texas. 



*S'. (•alifornicus Lee, California and Nevada. 



DASCYLLID^. 

 ACNEUS Horn. 



This genus was founded by me on a 9 in my cabinet which suggested 

 a form distinct from any of the genera known. For its characters I 

 could only say that " the prosternum is depressed between the coxae, the 

 latter therefore more prominent than it." 



The parts of the mouth are very similar to those of Ectopria, which 

 it otherwise resembles except in the characters of the male which are 

 as follows : 



Male. — Antenna) with first joint stout, suddenly narrowed at base, 

 second small, oval, third longer than the first two together, slender, 

 slightly })roa(ler externally, fourth short, bearing a short branch, joints 



