MONOGRAPH OF WEST INDIAN STAPHYLINIDAE 89 



Genotype. — Lathrohiuin sphaericoUis Sny =ApoceUus sphaericoUis 

 (Say) (designated by Duponcliel, 1841). 



Dkignonis. — Body glabrous, robust; integuments smooth; no ocelli; 

 but with distinct pits of dorsal arm of tentorium ; gular sutures united 

 anteriorly; antennae 11-segmented; labrum quadrate; palpi subulate; 

 anterior coxal cavities confluent, entirely open behind; anterior coxae 

 prominent; posterior coxae contiguous, not expanded laterally under 

 the femora; abdomen strongly margined, first sternite not present; 

 sternite of second segment normal, not carinate; in male, seventh 

 sternite more or less modified; posterior trochanters small; tibiae 

 without rows of spines ; tarsi 3-segmented ; posterior ones larger than 

 half of the tibia. 



Remarks. — This is a genus readily distinguished by its facies as 

 well as by structural characters. 



I have seen 33 examples of this genus from the West Indies. 



KEY TO WEST INDIAN SPECIES OF APOCELLUS 



1. Pronotiim and elytra longitudinally strigiilose 2. planus 



Pronotum and elytra not strigulose 1. ustulatus 



1. APOCELLUS USTULATUS Erichson 



Apocellus ustulatus Erichson, 1840, p. 813. — Lacordaire, 1854, p. 120. — Kraatz, 

 185Sa. p. 807.— Bern HAUER and Schubert, 1911, p. 108.— Leng and Mutch- 

 LER, 1914, p. 404. 



Description. — Flavotestaceous to rufotestaceous, elytra piceotesta- 

 ceous with apex nigropiceous, apex of abdomen nigropiceous. Head 

 one-eighth wider than pronotum, suborbicular, smooth, feebly im- 

 pressed longitudinally on each side in front; supraantennal tubercles 

 large and prominent; antennae longer than head and pronotum, 

 incrassate; labrum rather large, twice as wide as long, rather deeply 

 emarginate, with membranous lobes at anterior angles; gular sutures 

 united from near constriction, Y-shaped anteriorly; third segment 

 of maxillary palpi large, fourth acicular. Pronotum small, one-fifth 

 wider than long; apex one-third wider than base, half as wide as 

 elytra; convex, smooth. Elytra two-fifths longer than pronotum; 

 smooth, shining. Abdomen smooth. Male, posterior margin of sev- 

 enth sternite interrupted by an oval membranous cushionlike area; 

 eighth sternite broadly concave, rather deeply triangularly emargi- 

 nate posteriorly. Length, 2 to 2% mm. 



7'ype locality. — St. John. 



Types. — Probably either in the Hope Museum, Oxford, or the Zo- 

 ologische Museum, Berlin. 



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



St. John: (Erichson, 1840; Lacordaire, 1854). 

 St. Croix: (Blackwelder stations 331, 344). 



419008—42 7 



