412 SEREICOKNIA. 



and very little wider than it at the base, slightly flattened on the disc, arcuately narrowing from the 

 middle ; closely and very finely punctate, without trace of striae. Beneath closely, minutely punctate, 

 the pro- and metasternum much smoother along the centre. Prosternum with a small, densely punctured 

 fovea in the middle in the male. 

 Length lf-lf, breadth £-f millim. ( c? 2 •) 



Hob. Guatemala, Paraiso [Champion). 



Fourteen examples, from the vicinity of the Pacific coast, and all attracted to light 

 (in company with some very minute Dytiscidae), probably from the banks of a small 

 stream in the neighbourhood. 



This minute species is allied to H. quadrisignatus ; but it is much smaller and less 

 elongate, the elytral spots are lateral (one being basal and the other apical), the 

 punctuation is finer, and the metasternum is much more sparsely punctured. The 

 markings are constant. 



7. Hypnoidus quadrisignatus. (Tab. XVIII. fig. 19.) 



Oblong, moderately convex, shining ; black, piceous, or pitchy-brown, the prothorax sometimes entirely 

 testaceous or paler in the middle ; the elytra each with two testaceous or yellowish spots on the disc — 

 one, large and subtriangular, before the middle, the other, oval or rounded, smaller, towards the apex ; 

 the antennae and legs testaceous ; the under surface reddish-brown ; above and beneath very finely and 

 sparsely pubescent. Head closely, very finely punctate ; antennae slender, feebly serrate, about reaching 

 the hind angles of the prothorax, joint 3 slightly shorter than 2. Prothorax broader than long, trans- 

 versely convex, about equal in width in front and behind, rounded at the sides, the latter sinuate before 

 the base ; the hind angles acute, slightly divergent, and sharply unicarinate, the carina short and almost 

 straight ; the surface closely, very finely punctate, and with a smooth median line. Elytra about two 

 and one-half times the length of the prothorax, and slightly wider than it at the base, flattened on the 

 disc, arcuately narrowing from the middle ; very finely and closely punctured, without trace of striae. 

 Beneath closely, very finely punctate, the prosternum sparsely punctured. Prosternum with a densely 

 punctured fovea in the middle in the male. 



Var. The upper surface entirely black or piceous. 



Length 2-2|, breadth f-1 millim. ( d" $ .) 



II ab. Panama, Tole (Champion). 



Found in abundance on the sandy banks of a river near Tole. The colour is variable, 

 but in most of the specimens the spots are well-defined. Allied to II. obliquatulus 

 (Melsh.). The elytra are a little more flattened than in //. quadriplagiatus^ &c. 



8. Hypnoidus mexicanus, (Tab. XVIII. fig. 20.) 



Cryptohypnus mexicanus, Pleut. Ann. Soc. Ent. Belg. 1895, p. 171 \ 

 Hob. Mexico 1 ; Guatemala, Paso Antonio ( Champion). 



Numerous examples of this insect were found on the banks of a lagoon near the 

 Pacific coast of Guatemala. H. mexicanus closely resembles the N.- American H. obli- 

 quatulus (Melsh.), but it is narrower, the disc of the thorax is yellowish, and the hind 

 angles of the latter are a little less divergent ; the elytra sometimes have a narrow 

 transverse or oblique fascia towards the sides at about the middle, and a faint spot on 



