154 GEO. H. HORN, M. D. 



This species is very distinct by the structural characters given in 

 the table, the punctuation although finer and denser than in the pre- 

 ceding species is a character of far less moment. 



Occurs in New York, Pennsylvania, Ohio, and one from Camp 

 Grant, Arizona. 



QUEDIUS Steph. 



The head is oval or orbicular, sometimes moderately elongate 

 (^peregrmus), and posteriorly variably constricted. . The front in many 

 species has two punctures in addition to a normal series of four punc- 

 tures which are placed . (1), at the base of the antenna ; (2), near 

 the margin of the eye anteriorly; (3), near the margin of eye pos- 

 teriorly; (4), behind the eye. 



The ei/es vary in size and prominence in the different species, are 

 oval, usually placed slightly obliquely to the axis of the head and 

 often subtruneate in front. 



The antennm also vary in form, being either very slightly thickened 

 externally, in which case the joints 4 — 10 are as wide as long or 

 nearly so, or slender where these joints are longer than wide, or 

 subfusiform {explanatus), stouter at middle than at base or tip. The 

 second joint is normally much shorter than the third, frequently 

 however as long. 



The head beneath presents nearly the structure already mentioned 

 as characteristic of the Bolilohii, (Trans. Am. Ent. Soc. 1877, vi, p. 

 83), that is, there is a well marked elevated line extending along the 

 side of the head beneath, from the base of the mandibles to the 

 nuchal constriction, and as might be expected is better developed in 

 that species which resembles Bolitohlus in appearance {vernix), and 

 disappears almost entirely as the species approach Philonthus. 



The thorax in most of the species is narrowed in front with the 

 sides toward the edge regularly deflexed. In ferox the thorax has 

 nearly parallel straight sides, and in explanatus there is scarcely any 

 narrowing to the front. Two species {exi)lanatn$ and spelseux) have 

 the sides distinctly explanate, the same is sometimes feebly indicated 

 in specimens of falyidus. In all our species with two exceptions 

 (verjiix, ferox), there is a discal series of three punctures, by the 

 Erichson method of numeration, the anterior of which is usually on 

 the apical margin ; other punctures forming a series lateral to this 

 often occur and others, smaller, along the apical, lateral and basal 

 margins. In the exceptions above noted there are but two punctures 

 in the discal series. 



