THE G150UKM1 BKKTLES. 



30 



///(. Hind cdx.-i' Udl scparnlcd : labruiii iidl, I'di'l^cd. 



r. Aiaiidilili's williniii ,i lirisi Ic hca rini,' piiiict lire dii ihc dutci' side; 



si/-i' liir^'c. IS di- iiKirc iiiiii. 'I'rihc III. Cakauim, p. -14. 



cc. Mandibles each with a hrisi Ir iicai'iiii,' ininctiirr (.11 the ootcf side; 



smaller, not over 1'2 mm. Tribe V. Nkbkuni, p. 5(». 



(/(/. I'ront ecKxal cavities closed behind. 



(/. rrosti'rnum jirolnni^ed and dilafed, entirely concealinj^ the meso- 

 steriunn ; scntellnia invisible. Tribe I. Oaioimikonini, ]>. '.\U. 



ilil. rrdstefiium not cdncealiii;,' the inesdslernuni. 



(. .Antenna' Ciee at iiase; body not peduncidate. the liases of tliorax 

 and elytra in cdntacl : sculelUMn visible. 



Tribe 1 \'. Ki,ai'iikim, ]>. 4s. 



ee. Antenna' arising nnder a trdntal plate; Ixidy pednncnlate. the 



bases of thorax .-md elytra reiin»te; scntellnni not visible; hind 



coxie coutiguons. Tribe VL. Scabitini, p. ^li. 



Tribe I. OMOl'lIKONINl. 



Antenna' slender, inserted under a slight frontal margin, four 

 basal joints glabrous; mandibles with a l)ristle-l)earing punct\ire on 

 outer side ; second .joint of labial pal{)i with several sette or bristle- 

 like hairs; body not ])edunculate ; mesosternum covered by the 

 prolonged pi'osteriniiii. The tri])e is represented l)y th(^ single 

 genus : 



I. Omophron Latr. 1802 (Or., "savage-like.") 



Form oval, convex; scutellum invisible. The species occupy 

 holes in wet sand along the margins (»f streams, p<mds and lakes. 

 They are also often 

 found under stones or 

 in holes between the 

 roots of plants along the 

 water's edge, and are 

 f r(M( 11 e 11 1 ly caught in 

 minnow seines. Ry 

 thi'owing water ovtM- the 

 sand banks they can be 

 forced (mt and are then 

 easily captured, as they 

 do not fly. For detailed 

 papers on the genus see : 



Horn. — "Synopsis of 

 m o phroii." in 

 Trans. Amer. 

 Ent. Soc. Til. 

 1S70. 71. 



Fig. 27. Omnphrim lahmtum V:\h. 



i). lAfl(T Fori..-.- 



