408 SERBICOBNIA. 



Horn, H. canescens, and H. guatemalensis, and the second H. ohliquatulus (Melsh.), 

 H. pectoralis (Say), and several new species described below ; to the second group also 

 belong the South-American Crytohypnus oberthuri, C. atomus, and C. cequalis, Cand., and 

 C. nivalis, Fairm. 



The genus Hypnoidus is very widely distributed, and contains a large number of 

 species. They are chiefly found on the sandy shores of rivers and lakes, under stones, 

 or at the roots of plants. 



a. Elytra striate, immaculate. 



a'. Prothorax produced in the middle in front, the hind angles carinate. 



a". Outer elytral striae well defined cucullatus. 



b". Outer elytral strise obliterated canescens. 



V '. Prothorax truncate in the middle in front, the hind angles not carinate ; 



outer elytral strise obliterated guatemalensis . 



b. Elytra confusedly punctured, without trace of strise, usually maculate * ; hind 



angles of the prothorax with a short carina. 

 (J. Upper surface shining or moderately shining ; prothoracic punctuation fine, 

 c". Hind angles of the prothorax rather long, distinctly divergent. 



a'". Elytra testaceous, with a common post-median fascia or diamond- 

 shaped mark, the suture, and sometimes a scutellar patch, infuscate. teapensis. 

 b"'. Elytra each with a broad ante-median fascia, narrowing inwards, 



and an apical spot, neither reaching the suture, flavous .... quadriplagiatus. 

 d". Hind angles of the prothorax short, not or very feebly divergent. 



c' n . Elytra each with a large, triangular humeral patch and an oval apical 



spot flavous tetraspilotus. 



d"'. Elytra each with two rather large flavous spots on the disc .... quadrisignatus . 

 e"'. Elytra each with, at most, a narrow oblique median fascia towards the 

 sides, and sometimes a faint apical spot, testaceous or flavous ; 



prothorax piceous, with the disc paler mexicanus. 



d'. Upper surface rather dull ; prothoracic punctuation more distinct ; hind 



angles of the prothorax short and feebly divergent pectoralis. 



1. HypnoiduS CUCUllatuS. (Tab. XVIII. figg. 13 ; 13 «, underside of the 



prothorax.) 



Cryptohypnus cucullatus, Horn, Trans. Am. Ent. Soc. xviii. p. 17 (1891) x . 



Hypnoidus cucullatus, Horn, Ent. News, v. p. 7 2 . 



Oblong-oval, rather broad, convex, opaque, the elytra slightly shining ; black, the anterior margin of the 

 prothorax sometimes rufescent in the centre, the elytra brassy, the first three joints of the antennae 

 usually partly testaceous, the legs testaceous, with the femora more or less infuscate in the middle : the 

 prothorax with a large, well-defined patch of silvery pubescence on either side at the base, the elytra 

 somewhat thickly, and the rest of the upper surface sparsely, clothed with fine decumbent yellowish- 

 cinereous pubescence, and also with scattered semierect whitish hairs, which are long and somewhat 

 conspicuous on the elytra ; the under surface thickly clothed with yellowish-cinereous pubescence. Head 

 broad and flattened, densely, very finely punctate, the eyes small ; antenna? slender, feebly serrate, moderately 



* Dark varieties occur of some of the species. 



