348 BULLETIN 18 2, UNITED STATES NATIONAL MU&EUM 



Remarks. — The description of the elytral coloring given above should 

 be modified as follows: A median black band from margin nearly to 

 suture is black, the apical third is testaceous, the remaining part at 

 base and along suture is so darkly piceous as to be scarcely distinguish- 

 able from the black band. It appears to me to be a coloration very 

 similar to that described by Cameron for thoracicus^ but there seems 

 to be ample distinction in the sculpture of the pronotum. 



The two specimens in the Museum of Comparative 2jOology differ 

 from the type in having a much lighter color wuth the elytral spot much 

 clearer. Tliey do not seem to differ otherwise. 



I have no record of the habits of this species. 



L. STILOSAURUS, new genus 



Genotype. — S. rulomus Blackwelder (designated here). 



Diagnosis. — Body moderately slender, strongly constricted; an- 

 tennae filiform, not geniculate; labrum enlarged at middle, bidentate 

 with additional angulations; maxillary palpus long, third segment 

 enlarged, fourth minute; gular sutures united; prothorax slightly 

 oval, not much prolonged at middle in front; prosternum expanded 

 under coxae as far as but not connate with the hypomera ; anterior coxal 

 cavities closed behind (by the sternum beneath the coxae rather than 

 by the hypomera) ; front coxae conical, prominent; middle coxal cav- 

 ities confluent; posterior coxae conical, approximate; abdomen mar- 

 gined; somewhat contracted toward base; first and second sternites 

 absent; in general, eighth stcrnite feebly emarginate in males, feebly 

 prolonged or rounded in females; fourth segment of tarsus lobed 

 beneath. 



Remarks. — This genus is readily recognizable by the absence botli 

 of umbilicate punctures and of dense coarse sculpture. It usually has 

 fine ground sculpture and sometimes shows traces of umbilicate punc- 

 tures, as if they were obsolescent. 



I have seen 11 examples belonging to three species, all of which, 

 are herein described as new. 



KEY TO WEST INDIAN SPECIES OF STILOSAURUS 



1. Head with epistomal suture and anterior part of coronal suture distinct. 



3. coronalis 



Head without raised line marking epistomal and anterior part of coronal 



sutures 2 



2. Anterior part of pronotal midline marked by a raised line in a depression. 



2. lineatus 

 Anterior part of pronotal midline depressed but without raised line. 



1. rulomu8 

 1. STILOSAURUS RULOMUS. new species 



Description. — Rufopiceous to castaneous. Head moderately large, 

 semicircular behind, quadrat<j in front, about as wide as elytra; eyes 



