NOUTII AMERICAN COLEOPTERA. 87 



lique carinte, the ai)ical angle prolonged in a spiniforni j)rocess, the 

 spurs long and slender. Posterior tarsi slender, the first joint elon- 

 gate, claws small. 



This genus is closel}' allied structurally to Atienius, and the species 

 of the latter were included in Euparia until separated by Harold in 

 1867. In fact the distance between the two genera is partly oblit- 

 erated by Atcenius socialis, and they would be made still closer by 

 the separation of the latter as a distinct genus and the only advan- 

 tage gained would be another name. 



The only characters to be relied on in separating the two genera 

 mentioned are in the form of the thorax (broad with deplanate mar- 

 gins) and the middle and hind tibiie (arcuate in Euparia, straight 

 in Atcenius). 



K. castaiiea Serv. —Oblong, parallel, convex, piceous shining, spar.sely 

 hairy, beneath and lejjs brown. Antennae ferruginous. Head vertical in repose, 

 coarsely, closely and roughly punctured in front, more sparsely and finely poste- 

 riorly. Clypeus at middle truncate and vaguely emarginate, on each side arcuate, 

 an incisure at end of frontal suture, genje very prominent, subacute. Thorax 

 one-half wider than long, anterior angles rounded, sides slightly undulating, 

 parallel, the margin explanate, widely in front, very narrowly behind, hind an- 

 gles distinct, but obtuse, the base lobed at middle, suddenly sinuate near the 

 angles, without basal marginal line, disc subgibbous at middle, sparsely muri- 

 cately punctulate. the lateral margin quite smooth. Elytra much narrower than 

 the thorax, base rather deeply emarginate, the humeral angles prominent to the 

 front with an oblique carina forming a portion of the basal margin, the disc 

 finely striate, stripe punctate, intervals flat, with numerous coar.se punctures, 

 which are somcwliat muricate on the declivity, those punctures on the side inter- 

 vals have a sul)biseriate arrangement. Mesosternum opaque, rather I'oughly 

 punctured in front, more sparsely behind, a fine carina between the coxa;. Meta- 

 sternum nearly smooth. Abdomen sparsely nmricately punctate. Posterior 

 femur spar.sely punctate, first joint of hind tarsus longer than the next three. 

 Length .20 inch ; 5 mm. 



The entire surface of the body has short yellowish hairs arising 

 from all the punctures, the legs are also sparsely hairy. 



The form of this insect is so unlike any other species in our fauna 

 as to make it readily known. The figure ])ublished by Westwood, 

 although giving a good general idea of the insect, is far from accu- 

 rate in many of the even important details. 



Occurs in Florida, Alabama and Louisiana in the nests of a small 



ant. 



RIIYSSEMTS Muls. . 



In this genus the head is deflexed, the eyes invisible in re})ose. 



Labrum and mandibles concealed beneath the clypeus, the molar 



tooth of inandibles corneous. The maxilhv are membranous, the 



