MONOGRAPH OF WEST INDIAN STAPHYLINIDAE 491 



1. THYREOCEPHALUS SUBTILIS Sharp 



Thyreocephaliis stibtilis Sharp> 1S85, p. 499. — Beknhauek and Schubekt, 1914, 

 p. 313. 



Description. — Black, shining; elytra with a bluish luster. Head 

 suborbicular, basal angles scarcely traceable ; eyes at less than three 

 times their length from base; gular sutures united throughout their 

 length; punctation composed of scattered large and somewhat um- 

 bilicate punctures and smaller usually elongate punctures between, 

 the latter not dense and with minute punctulae between; anterior 

 margin with feeble ground sculpture of lines. Pronotum less than 

 one-half longer than wide, widest at anterior angles, feebly narrowed 

 to posterior angles; disk entirely impunctate; shining. Elytra with 

 somewhat indefinite but moderately large punctures obscured by dense 

 coriaceous ground sculpture. Ahdomen very sparsely, finely, sub- 

 muricately punctate; with transverse strigulae throughout. Length, 

 14 mm. 



Type locality. — Panama, Volcan de Chiriqui. 



Types. — In the British Museum. 



Records. — The following are the records known to me : 



St. Vincent: (British Museinn). 



South America: Venezukt.a (Sharp, 1885), Venezuela, Peeu, Brazil (Bern- 



hauer and Sclinbert, 1914). 

 Central America: Panama (Sharp, 1885; Bernhauer and Schubert, 1914). 



Specimens examined. — I have seen the type and four examples 

 from the West Indies in the British Museum, as well as several 

 examples from South America, One of the West Indian examples 

 was borrowed for further study. 



Remarks. — This species may be distinguished from others of the 

 genus by the color and the punctation of the head and pronotum. 



I find no record of its habits. 



LXXIX. Genus PLOCHIONOCERUS Sharp 



Plochionoccrus Sharp, 1885, p. 471. 

 Ptochionocerus Borgmeier, 1931, p. 3G0. 



Genotype. — Sterculia formicaria l^vichson= Plochionocems formi- 

 carius (Erichson) (original designation). 



Diagnosis. — Head aiui pronotum densely umbilicately punctate; 

 antennae inserted close together at front of head, with clypeus 

 slightly ])roduced between them, outer segments pubescent from the 

 fourth joint, basal segment one-half or more as long as head; an- 

 tennal grooves distinct; labrum small, feebly emarginate; maxillary 

 palpus short, fourth segment longer than third, glabrous except for 

 tactile setae; last segment of labial palpus somewhat enlarged, securi- 



