AxMERICAN COLEOPTERA. 133 



exclusion of Physocrotaphna and its union with the HeUuonini in which 

 position it appears in the Munich Catalogue. From the figures and 

 description it seems to me probable that this also is incorrect, while the 

 details already known to me seem clearly to indicate its afiiuities, but not 

 knowing the insect in nature it seems unnecessary to venture farther. 



Those genera without neck to the head should, in great part,, if not 

 all be excluded, especially those with truncate elytra (see remarks on 

 Basoh'a, etc., in Cratocerini). This tribe is represented in our fauna 

 by Morio monilicornis Latr., a shining black insect of moderate size, 

 resembling somewhat Pterostichus. It occurs in the Southern States 

 and is found under bark. 



Tribe XXII.— Bembidiini. 



Antennfe slender, arising under a slight frontal margin, tlie first two or often 

 the first only glabrous, third joint sometimes not longer than the seeond. Head 

 rarely narrowed behind the eyes to a neck ( Thafafisobius) , with two supra-orbital 

 setse. Eyes round prominent, very narrowly sejjarated beneath from the mouth 

 {ahsent in Anillus and Scotodipnus). Clypeus usually inoderateh' prolonged and 

 with an erect seta on each side. Labrum transverse, sexsetose in front, rarely 

 quite small (certain Bembidia). Mandibles feebly arcuate, acute at tip and with 

 a setigerous puncture externally. Maxillw slender, hooked lit tip, ciliate or slightly 

 spinulose within, the outer lobe slender and biarticulate or with the two joints 

 united (Amerizus), the palpi moderate in length, the last joint usually snuill, 

 subulate, sometimes conical, the penultimate club-shaped and pubescent. Mentuin 

 with basal suture distinct, variably emarginate, toothed, the tooth simple or 

 notched, the ligula broader in front, free and truncate at tip and bisetose, the setre 

 usually very closely approximated, the paraglossse slender, longer than the ligula 

 and not ciliate within, the palpi moderate in length, the terminal joint small, 

 subulate, the penultimate more or less club-shaped and bisetose in front. Thorax 

 with a setige'rous puncture at the side and at the hind angle. Elytra sometimes 

 margined at base, sides narrowly inflexed, the margin interrupted posteriorly and 

 with a distinct internal plica, disc with dorsal punctures or fovete. Prosternum 

 not prolonged. Mesosternum moderately separating the coxa;, the epimera moder- 

 ately broad and wider externally. Metasternal epimera distinct, posterior coxaj 

 contiguous. Legs moderate, the middle and posterior tibiae slightly ciliate exter- 

 nally, the anterior deeply emarginate within and sometimes with the outer apical 

 angle obliquely truncate '(certain Tachyti). Tarsi slender, claws simple, rarely 

 serrulate {Elaphropv.x). Surface usually glabrous, pubescent in ( Tachypus). 



The males have usually two joints of the anterior tarsi dilated and squaniu- 

 lose or pilose (Tachypus) beneath, but in some Tachys the tarsi are simihir in 

 the sexes. 



This tribe is about as well defined as any in the Carabidse, the form 

 of the hist joint of the palpi being peculiar to it and giving the name by 

 which it is often, known, Suhuliptdpi . 



It is remarkable that, in a tribe so remote from Caliistun, the form 

 of the outer lobe of the maxilla in that genus should be here repeated. 

 It must however be especially remarked, that there is in Amerizva no 



(29). 



