170 Journal New York Entomological Society. [Voi. xxvi. 



This, apparently the most common of the species in northeastern 

 America, varies but sHghtly. The anterior angles of the prothoracic 

 incisure are somewhat more prominent in certain specimens than in 

 others, where an approach is made towards the condition found in 

 spatulata. In the latter, the angles are, however, definitely prolonged 

 into lobes and the posterior processes proceed more definitely from 

 the base. Percomis is to be found in the Great Lakes region and the 

 northeastern tier of states. One specimen, from Texas in the Na- 

 tional Museum collection, has been seen. In the LeConte collections 

 the specimen bearing the names is not percomis but spatulata. Speci- 

 mens two and three, the types of longicornis and ciirtus, are correctly 

 placed. (Plate IX, fig. 6.) 



Silis pallida Mann. 



Silis pallida Mann., Bull. Mosc, Vol. II (1843), p. 246. 

 Silis pallida Esch., Dej. Cat., 3 Ed., p. 121. 



Silis pallida Leo., Trans. Amer. Ent. Soc, Vol. V (1874), pp. 60 and 62; 

 Trans. Amer. Ent. Soc, Vol. IX (1881), p. 57. 



This Species is black with the pronotum orange margined with 

 black and with a large median basal black spot as well, and the elytra 

 of a light yellow suffused with black along the margins and at the 

 apex. From other light species it can be readily separated by its 

 shallow incisure and small slightly hooked ante-basal process. It 

 ranges from Sitka, Alaska, the type locality, south through western 

 British Columbia, Washington, and Oregon. In the last two, the 

 typical form is most common in the country between the Cascades 

 and the Coast Range Mountains, the melanotic variety taking its 

 place west of the coastal mountains. Specimens from Sitka as well 

 as good series from other parts of its territory have been seen. 

 (Plate IX, fig. 7.) 



Silis pallida var. maritima new variety. 



Elongate, shining, black with yellow mandibles and the sides and front 

 of pronotal disc an orange yellow. Head as broad as apex of prothorax, de- 

 pressed between the eyes ; eyes moderately prominent and widely separated ; 

 antennae fairly stout and almost reaching to apex of elytra. Prothorax 

 broader than long, as broad as base of elytra, apex broadly rounded, sides 

 in front almost straight and slightly diverging posteriorly, the region of the 

 posterior angles shallowly incised, the anterior angle of the same obtuse and 

 the posterior angles small and acute, with a small and short hook-like ante- 

 basal process projecting outwards from just in front of the posterior angle. 



