154 BULLETIN 182, UNITED STATES XATIONAL MUSEUM 



continued forward diagonally as a submarginal ridge ; center of vertex 

 with a strong elevation partially divided longitudinally by a deep 

 groove, leaving two ridges that are most prominent posteriorly ; with 

 a large fossa immediately inside the lateral margin just over each 

 eye. Pronotum with strong ridges and depressions ; three-fifths wider 

 than long, one-fourth wider than head ; outer pair of four longitudinal 

 ridges short and extending from front angles to third tubercle, middle 

 pair very strongly carinate, more or less joined at the front margin 

 and also at the base ; this pair separated from the sides by three large 

 f oveae on each side ; all four angles prominent, tuberculate, and side 

 margins bearing also two other tubercles on each side. Elytra one- 

 fourth wider than pronotum, one-fourth wider than long; nearly 

 straight at the sides; outer apical angles rounded; with four strong 

 longitudinal costae separated by double rows of very large punctures. 

 Integuments finely and very densely sculptured, not so evident on 

 pronotum and abdomen. Length, 2 mm. 



Type locality. — Trinidad, deep in cave in Aripo Valley, elevation 

 2,600 feet. 



Types. — Holotype and 10 paratypcs, Museum of Comparative Zool- 

 ogy; 6 paratypes in the United States National Museum (No. 52480) ; 

 all taken at the type locality by N. A. Weber on April 19, 1935. 



Records. — The following is the only record known to me : 



Trinidad: Aripo Valley (Weber, in M.C.Z. and U.S.N.M.). 



Specimens examined. — I have seen only the 17 types. 



Remarks. — This species can be confused with none except dentlcolUs. 

 It agrees in a general way with the description of the latter but seems 

 to be much more developed. Inasmuch as dentlcollh has never been 

 reported since the original description and was from Puerto Rico, it 

 seems best to treat these Trinidad specimens as distinct until more data 

 are at hand. 



They were collected from "mouth of cave" to "deep in cave," without 

 further details. 



7. THORACOPHORUS DENTICOLLIS (Erichson) 



Olyptonia dcnticollis Erichson, 1840, p. 910. — Lacobdaibe, 1854, p. 149. — Fau\'EL, 



18G5, pp. 63, 64.— Leno and Mutchu.r, 1914, p-. 403. 

 Thoracophorus denticoUis (Erichson) Bexnhaueb and Schubebt, 1910, p. 25.— 



Leng and Mutchi.eb, 1914, p. 403. 

 Thoracophorus dentricoUis Wolcott, 1924, p. 77; 1936, p. 196. 



DescHption. — Testaceoforrugineous, head, pronotum, and abdomen 

 above darker. Head longer than pronotum, marginatc at front and 

 sides; bituberculate at middle. Pronotum a little narrower than 

 elytra, wider than long; subdepressed ; unevenly costate, tuberculate, 

 and foveolate; lateral margin dilated, quadridentate; posteriorly sud' 



