AEGIAI.ITIDAE. 387 



of the front, above tlie insertion of the antcMina', arc horizontal, 

 antl tlie hiteral margin extends to the anterior nuu\i!;in ; in this 

 and tlie next tribe the lateral margin is elevated into an obliqne 

 ridge, which becomes obsolete before attaining the anterior niaigin 

 of the front. 



The present tribe has but one representative in the Atlantic 

 district, Mcracantha conlravla, found under bark; it has received 

 many names, but the oldest is that of Ht-lops contractus Beau v. 



Tribe XVII.— STR0X«;YLII]¥I. 



Body elongate, winged; head not received in the thorax as far 

 as the eyes, which are large, transverse, eniarginate, and some- 

 what coarsely granulated ; mouth broadly but slightly prolonged; 

 front separated from the labruni by a coriaceous clypeus; sides 

 dilated over the insertion of the antennfe, and obliquely elevated, 

 elevation not extending to the anterior margin of the front; 

 meiitum trapezoidal; ligula prominent; last joint of palpi strongly 

 securiform; antennfe long and slender, outer joints very slightly 

 thicker. Epipleura^ narrow, extending to the tip of the elytra ; 

 luetasternum long ; anterior coxjb rounded ; middle coxre with 

 distinct trochantin ; hind coxiB narrowly separated ; legs long; 

 tibial spurs very small; tarsi pubescent beneath. 



But one genus, Strongylium, is represented by five species 

 found under bark in the Atlantic district; two of them differing 

 somewhat in the form of the thorax are described by Say; S. 

 tenuicolle Lac. (Helops ten. Say) has the thorax subcylindrical, 

 and as long as wide; S. terminatvm Lac. {Tenehi^io terminotus 

 Say) has the thorax somewhat narrowed in front, and wider at 

 the base than its length. In both species the last joint of the 

 antennae is pale yellow. 



Fam. LIX.— aegialitidae. 



Mentum very transverse, trapezoidal, narrower in front, 

 supported on a very short and broad gular process; ligula 

 broad, prominent; labial palpi widely separated, short, 

 3-jointed. 



Maxillfp ciliate within, bilobed, the inner lobe very short, 

 the outer broad, obtuse at tip, base prominent; palpi shori, 

 4-jointed, scarcely dilated. 



