490 BULLETIN IS 2, UNITED STATES >;'ATIO'NAL MUSEUM 



Types. — Presumably in the collection of Blanche Rancin, Caen, 

 France. 

 Records. — Tlie following are tlie records known to me: 



Trinidad: (Fanvel, 1901; Bernhauer and Sclnibert, 1914; Leng and Mutcliler, 



1914). 

 South America: Colombia (Fauvel, 1901; Bernhauer and Schubert, 1914). 



Specimens exmmned. — I have seen no examples of this species. 



Remarks. — The original description is insufficient to identify this 

 species with certainty, but I believe it to be distinct as separated in 

 the key. I am unable to guess whether Ihe Trinidad examples of 

 Fauvel are the same as his Colombia ones. 



I find no record of the habits of this species. 



LXXVIII. Genus THYKEOCEPHALUS Guerin 



Thyreocephalus Gtjep.in, 1844, p. 10. 



TJnidius Sharp, 1876, p. 196. 



Jndoscitalinus Heller, 1901, p. 5. 



Indoscitalus Eichkbaum, 1909, p. 165 (misspelling). 



Dinoxantholmus Heller. 1910, p. 7. 



Thyroccephahis Sciieerpeltz, 1933, p. 1818 (misspelling). 



G&rtotypes. — T. jekelii Guerin (monobasic). Of Indoscitalhnis^ I. 

 albicomis Heller (monobasic) ; of Linidlus, L. recticollis Sharp 

 (original designation) ; of Dinoxantholinus^ D. prodigio»us Heller 

 (monobasic). 



Diagnosis. — Head not densely punctured, disk of pronotum not at 

 all punctate; antennal grooves distinct, ocular grooves absent; 

 antennae inserted moderately close together at front of head, basal 

 segment over one-half as long as head, outer segments densely 

 pubescent from the fourth joint; labruin small, with prominent outer 

 xingles; maxillary palpus moderately long, fourth segment longer 

 than third; last segment of labial palpus slender; gular sutures 

 united; neck one-third as wide as head; pronotum with margin 

 double, the lines united in front; prostermun with ;i ]nui- of sclerites 

 in front of the sternite; elytral suture beveled; middle coxae widely 

 separated; posterior coxae contiguous, '"triangular"; first and second 

 abdominal sternites absent (except possibly for a small lateral rem- 

 nant of second) ; intersegmental membranes of abdomen marked with 

 a pattern of angular areas in longitudinal bands. 



Remxirhs. — This genus is distinguished by its united marginal 

 pronotal lines and the sparse punctation from all other West Indian 

 Xantholinini. 



Only one species has been found in our region. It presents an 

 unusual distribution, which can be accounted for only on the basis 

 of inadequate collecting. 



