320 GEO. H. HORN, M. D. 



CYBOCEPHAIiUS Erichs. 



Labrum entire. Mandibles acute at tip, a small tooth posteriorly. 

 Epistoma sliglitly prolonged at middle. Antennae scarcely longer 

 than the width of the head, the anteunal grooves small and con- 

 vergent. Prosternum acutely carinate in front, not prolonged behind 

 the anterior coxa3 which are very narrowly closed behind. Meso- 

 sternum broad, oblique, metasternum slightly protuberant. Thorax 

 margined at base, sides very short. Scutellum rather large. Tibiae 

 simple, tarsi slightly dilated, four-jointed, claws simple. 



The males have a rather large additional segment. 



The head is broad and deflexed, the mandibles resting against the 

 metasternum. The body is, in contraction, ovate and very convex. 



After a careful examination of the tarsi I am convinced that Duval 

 is correct and that there are but four joints, and that the claws are 

 simple. 



The resemblance of the species of this genus to Liodes is so very 

 great, that it might be considered quite pardonable to confuse them 

 without a careful examination of the anterior coxae and antennas. 

 The front of Liodes is truncate or broadly rounded, in Ci/hocephalus 

 prolonged at middle. 



Two species occur in our fauna. 



Surface black shining, thoracic margin with extremely narrow translucent 

 border, not at all explanate iiigritulus. 



Surface with distinct seaeous lustre, thoracic margin translucent and distinctly 

 explanate califoruicus, 



C nigritulns Lee. — Ovate, contractile, convex, black, very shining. 

 Legs pieeous. Head and thorax smooth, but under very high power very 

 finely alutaceous, sides of thorax with extreme margin narrowly translu- 

 cent not explanate. Elytra with extremely minute punctures very sparsely 

 placed in the basal region, sides and apex absolutely smooth but under high 

 power finely alutaceous. Body beneath coarsely punctate. Length .04 inch; 

 1 mm. (PI. Ill, fig. 15.) 



When the specimens are stretched out they are about one-half 

 nearly longer. 



Occurs in Michigan and Georgia. 



C. californicus n. sp. — Black, surface seneous and under high power 

 distinctly alutaceous. Thorax with lateral margin slightly explanate and 

 translucent. Elytra under moderate power distinctly but very sparsely puuctu- 

 late, smooth at sides and base. Length .03 inch; .75 mm. 



The length extended is about one-half greater. From the preceding 

 species this is known by the sides of thorax quite distinctly explanate 

 and more broadly translucent than in nigritulus. The punctuation 



