POMACHILITTS.— HYPNOIDUS. 407 



apices truncate and armed at the outer angle with a short, fine, acute tooth; punctate-striate, the 

 interstices almost flat and closely punctate. Beneath densely, very finely punctate ; fifth ventral segment 

 rounded at the apes. 

 Length 5-5|, breadth 1^-1| millim. ( d ? •) 



Hob. Panama, Volcan de Chiriqui 2500 feet {Champion). 



Nine examples. This species closely resembles the Colombian P. linearis, Cand, 

 and P. longicollis, Steinh., the types of which are before me. From the first-mentioned 

 it differs in having the outer apical angles of the elytra acuminate, as well as in its 

 smaller size, narrower shape, &c; and from the latter in the shorter third joint of the 

 antennae (this joint being as long as the fourth in P. longicollis), the shorter and 

 anteriorly convex thorax, and the less elongate elytra. This insect, like the preceding, 

 is unknown to Dr. Candeze. 



Group CRYPTOHYPNINI. 



HYPNOIDUS. 



Hypolithus, Eschscholtz, in Thon's Archiv, ii. 1, p. 33 (1829) (nee Dejean, 1829). 



Hypnoiclus, Stephens, Illustr. Brit. Ent., Mandib. iii. p. 260 (1830) (part.); Bergroth, Ent. Nachr. 



xix. p. 308 (1893); Horn, Ent. News, v. p. 7 (1894). 

 Crypohypnus, Eschscholtz, in Silberm. Rev. Ent. iv. tab. (1836). 

 Cryptohypnus, Candeze, Monogr. Elat. iii. p. 55 (part.); Schiodte, Nat. Tidsskr. (3) iii. p. 519 



(1865) [Translation in Ann. & Mag. Nat. Hist. (3) xviii. p. 333] ; Horn, Trans. Am. Ent. Soc. 



xviii. p. 1 (part.) (nee Thomson). 

 Cryphthypnus, Kiesenwetter, Naturg. Ins. Deutschl. iv. p. 357 (1858). 

 Negastrius, Thomson, Skand. Col. vi. p. 110 (1864). 

 Zorochrus, Thomson, loc. cit. p. 116. 



The Central- American species here referred to Hypnoidus agree in having the meso- 

 thoracic epimera not reaching the coxse, the cavities being closed externally by the meso- 

 and metasternum, and the prosternal sutures arcuate and evidently convergent behind. 

 In Cryptohypnus, Thorns. (= Hypolithus, Schiodte), the mesothoracic epimera reach the 

 coxee, and the prosternal sutures are almost parallel; it contains various palsearctic and 

 nearctic forms of comparatively large size, and is not represented within our limits. 



The North-American species of Cryptohypnini have been exhaustively monographed 

 by Dr. Horn ; he has detected important male-characters in some of them, viz. the 

 presence of a densely punctured and thickly pubescent spot or fovea on the first or 

 second ventral segment, or on the middle of the presternum, a peculiarity to be found 

 in several of the new species here described. 



Not a single representative of the genus is contained in the extensive collections 

 formed by MM. Salle and Hoge, and it is probable that several Mexican species 

 remain to be discovered ; one, however, was found long ago at Teapa by Pilate. The 

 Central-American forms belong to two groups, the first of which includes H. cucullatus, 



