176 Journal New York Entomological Society. n'"i- xxvi. 



Silis abdominalis Schaef. 



Silis abdominalis Schaef., Journ. X. Y. Ent. Soc, Vol. XVI (igo8), p. 66. 

 The color, the less protuberant armature, smaller posterior lobe, 

 and shorter antennae, will readily separate this species from the pre- 

 ceding. It was described as from the Huachuca Mountains, but has 

 also been taken in the Chiricahua Mountains, also in southern Ari- 

 zona. (Plate IX, fig. 13.) 



Silis perforata Lee. 



Silis perforata Lee, Trans. Am. Ent. Soc, Vol. IX (1881), p. 57. 



This Species is very closely related to abdominalis, but is gener- 

 ally more elongate, grayer, more coarsely pilose, with only the front 

 of head, prothorax, and abdomen yellow, whereas the other has the 

 base of the antennae and basal portion of legs also similarly colored, 

 the prothorax proportionally broader, the anterior lobe of the arma- 

 ture longer and more distinctly truncate apically, the posterior lobe 

 more posterior, longer, broader, and more lamellate, extending out- 

 wardly well beneath the apex of the anterior so that a definite fenestra 

 appears when the view is from above, the basal foveae distinct though 

 small in contrast to the other where they merge with the basal sulcus. 

 The female has the prothorax transverse, completely and broadly 

 margined, with the apical margin broadly arcuate, the basal more dis- 

 tinctly arcuate, the sides slightly sinuate, and the hind angles small 

 and obtuse. The antennae are also shorter than in the male, as usual, 

 extending barely to the middle of the body in contrast to the male 

 where they extend fully three fourths the length of the body. The 

 species seems to be limited to Texas, specimens before me being from 

 San Antonio, Corpus Cristi, and San Diego. 



Silis fossiger Lee. 



Ditemnus fossiger Lee, Trans. Am. Ent. Soc, Vol. IX (1881), p. 58. 



This very pretty species, the only definitely vittate one in our 

 fauna, has in common with the following, the deep median pit in the 

 male pronotum and similar type of armature but it differs in detail 

 by having the anterior lobe not produced backwards, by the posterior 

 process being distinctly separated from it and by extending back- 

 wards as a narrow parallel-sided process with a deep emargination 

 at apex. The process also is distinctly separated from the posterior 



