114 Mr. G. C. Champion's Revision of the Mexican 



from Quiche (described by Gorham in his diagnosis as a 

 ? $ of ^. nigrita) was subsequently referred by him (loc. cit., 

 p. 293) to S. sepulchralis ; and the specimens from the 

 other localities quoted in his " Supplement " also belong 

 to other species, S. panamensis and S. fissicollis. In the 

 two examples seen of S. nigrita the testaceous coloration 

 of the head extends angularly upwards to the vertex. Two 

 other females from Guatemala (one acquired long ago by 

 the British Museum, the other from Purula), both in bad 

 condition, may belong here. 



21. Silis fissicollis, n. sp. (Plate IX, figs. 85, 86, 

 prothorax, ^, $.) 



Silis nigrita, Gorh., Biol. Centr. Am., Coleopt. iii, 2, p. 293 

 (part.) ( nee p. 93). 



Moderately elongate, shining, nigro-piceous or piceous, the head 

 in front, a spot on the vertex, the sides of the prothorax broadly, 

 the coxae, the femora to near the apex, and the tips of the tarsi, 

 testaceous; clothed with rather long fine pubescence. Antennae 

 ((J) long, closely set with short projecting hairs ; (?) a little shorter 

 and more sparsely pilose. Mandibles curved in both sexes. Eyes 

 large in <^, smaller in $. Prothorax {^) transverse, obliquely 

 bicallose on the disc behind, and with a short carina in the inter- 

 vening space, the margins plicate, sinuate, and reflexed, strongly 

 bidentate towards the base (the two dentiform projections separated 

 by a narrow deep notch, the anterior tooth oblique, angular, the 

 other straight, rounded at the apex), and constricted anteriorly 

 and immediately before the acute hind angles (fig. 85); (?) more 

 rounded at the sides, less narrowed in front, the margins thickened 

 anteriorly, and constricted before the prominent hind angles (fig. 86). 

 Elytra in (J about as wide as, in $ broader than, the prothorax, 

 subparallel, roughly sculptured. Inner claw of anterior tarsi with 

 a prominent angular lobe, and outer claw of the other tarsi, with 

 a smaller lobe, in ^. 



Length (excl. head) 5-6, breadth 1|-1J mm. {^ ?.) 



Hah. Guatemala, San Isidro and Las Mercedes, Pacific 

 slope. 



A pair from San Isidro (labelled S. nigrita, var., by 

 Gorham) and two females from Las Mercedes. In the 

 male of this insect the lateral prominences of the prothorax 

 are more developed than in S. nigrita and S. panamensis, 

 and the dentiform lobe of the inner anterior tarsal claw is 



