AMERICAN COLEOPTERA. 105 



violating some of the affinities but the numerical sequence above seems 

 to be the least objectionable. 



Representatives of all have been studied from nature except Hiletini, 

 so rare seem the species that with all my exertion I have been unable to 

 procure one of them. 



I can hardly allow the present occasion to pass without expressing my 

 great sense of obligation to Messrs. Bates and the Jansons of London, 

 Salle of Paris, and Dr. Dohrn of Stettin, for their ready response to my 

 calls for rare and valuable material. 



Tribe I. — Omophroniiii. 



Antennse slender, inserted under a slight frontal margin, four basal joints 

 glabrous. Eyes round, moderately prominent, distant beneath from the buccal 

 opening. Head deeply inserted, with one supra-orbital seta. Labrum short, 

 emarginate. Mandibles not prominent, arcuate, acute at tip, simple within or 

 slightly toothed near the base, outer side slightly concave with a setigerous 

 puncture. Maxillfe slender, inner lobe hooked at tip, spinulose within, outer 

 lobe slender biarticulate, palpi slender the last two joints equal. Mentum deeply 

 emarginate and with an acute tooth, ligula truncate and slightly broader at tip 

 and bisetose, the paraglossse free at tip but not longer, the palpi slender, second 

 joint longer than the terminal and plurisetose in front. Thorax applied directly 

 against the base of the elytra, sides with a single setigerous puncture a little 

 behind the middle. Scutellum invisible. Elytra convex, margined at base, sides 

 narrowly infiexed margin continuous. Prosternum rather widely separating the 

 coxpe, prolonged and dilated behind them and completely covering the meso- 

 sternum the coxal cavities closed behind. Mesosternum in front vertical and 

 carinate with two fossje to receive the under side of the anterior eoxse. Meta- 

 sternum short, epimera not distinct, posterior coxte contiguous. Tibipe finely 

 spinulose externally, the anterior slightly broader to tip, within obliquely grooved, 

 the inner spur above the apex. Tarsi slender. 



The males have one or two joints of the anterior tarsi dihited and spongy 

 pubescent beneath. 



One genus constitutes this tribe, Omophron, concerning which all 

 authors seem to be in accord in permitting it to remain alone. 



At first glance the posterior coxae seem to be separated, but a little 

 care will readily detect the small laminiform processes which by their 

 meeting conceal the small remnant of the first A^entral segment. 



European authors describe the ligula and paraglossse somewhat different- 

 ly but the figure given is that which will be found in 0. dentatum Lee. 



The plurisetose second joint of the labial palpi is a character of 

 extremely rare occurrence in the present sub-family, it is the usual 

 structure in Cicindelidse and very constant in Dryptini' and ITar|)alini 

 of the sub-family Harpalinac. 



The affinities of the present tribe are very difficult to define. It 

 seems out of place in any part of the series. Specialization of type 



TRANS. AJI. ENT. SOC. IX. (22) Air.M-ST. 1 SSI 



