356 BULLETIN 182, UNITED STATES NATIONAL MUSEUM 



LII. Genus STILIPHACIS Bierig 

 8tiliphaoi8 Biebio, 1938b, p. 142. 



Genotype. — S. occipitalis Bierig (original devsignation and mono- 

 basic) . 



Diagnosis. — Body moderately stout; antennae moderately slender, 

 not geniculate; labrum with two large median teeth and sometimes 

 two minute additional ones; maxillary palpus long, third segment 

 enlarged, fourth minute, pubescent; gular sutures united; prothorax 

 nearly circular, not much prolonged anteriorly at middle; proster- 

 num expanded under coxae nearly to hypomera but not connate with 

 the latter; anterior coxal cavities closed behind (by the sternum be- 

 neath the coxae rather than by the hypomera) ; front coxae large, 

 prominent; middle coxal cavities confluent; posterior coxae "conical," 

 approximate; abdomen margined, somewhat contracted at base; first 

 and second sternite absent ; in general, eighth sternite emarginate in 

 males, rounded in females: fourth segment of tarsi lobed beneath. 



Remarks. — This genus is known to me from an example sent to 

 me by Sr. Bierig several years ago and four species which appear 

 to be new. The above diagnosis was prepared before the appearance 

 of Bierig's description. 



As herein defined this genus differs from Stilicopsis (paradoxa) in 

 having labral denticles and in having the pronotal punctation similar 

 to that of the head, instead of having the punctures replaced by tub- 

 erculi. Tlie genus Dihelonetes is known to me only from an unde- 

 termined species from Nicaragua, but this differs from Stiliphacis 

 in the suborbicular shape of the head. Unless additional characters 

 are found, it is likely that these two will be united. 



I have studied 78 examples from the West Indies. They belong to 

 five species, of which three appear to be new. 



KEY TO WEST INDIAN SPECIES OF STILIPHACIS 



1. Labrum denticulnte at center 2 



Labrum not denticulate 1. exigua 



2. Pronotura nearly as wide as lonj? 3 



Pronotum one-tliird longer than wide 5. darlingtoni 



3. Elytra reduced, widest at apex 4. occipitalis 



Elytra not reduced, narrowed at apex 4 



4. Head completely rounded behind; 4 mm. long 2 trinitatia 



Head truncate behind; 2V2 mm. long 3. dentatita 



1. STILIPDACIS EXIGUA (Erirhson) 



Sunius cxiguus Ekichson, 1840, p. G47. — Kbaatz, 1857a, p. 666. — Biertg, lons. p. 



142, 

 Stilicopsis exigua (Erichson) Bkrnhaukb and Schubert, 1912, p. 220. — LF^•o and 



MuTCHi.ER, 1914, p. 404.— WoLcorr, 1924, p. 78 ; 1936, p. 197. 

 Stilicopsis circum/lcxu8 Cameron, 1913b, p. 332. — Lenq and Mutchxeb, 1917, p. 



198.— ScHFERPEi.Tz, 1933, p. 1237.— Bl.\ckwe> PER, 1939a, p. 115. 



