Sf!ARAB,«IDAE. 253 



tlilrd, fourtli, and fifth joints closely connected; the club 3-jointed, 

 elongated in the males ; the last spiracle is placed on the suture 

 between the connate fifth ventral and the propygidium ; the 

 ventral segments are six, not connate ; the legs are stout, the 

 hind femora and tibiaj much thickened ; the inner claw of the 

 anterior tarsi, and the outer claw of the middle tarsi (at least of 

 the male), is suddenly and broadly dilated at base into a large 

 rounded prominence. 



Epistoina much thickened in front, concavity a curved groove. 



Hypotrichia. 

 Epistoma normal in form, quadrate, deeply concave. Plectrodes. 



Hypotrichia spis^tipes, from Florida, is an oval, elongate insect, 

 half an inch long, of a piceous color, finely punctured above, with 

 the thorax transverse, rounded, covered with short grayish hair; 

 l)ody beneath densely clothed with long hair; elytra finely punc- 

 tured and pubescent. 



Three species of Plectrodes are found in California. 



Sub-Tribe 6.— Diplofaxiiii. 



Small, oblong, slightly convex species, usually brown, with the 

 elytra most frequently marked with rows of punctures alternately 

 approximate, with the wider spaces irregularly })unctured. They 

 are distinguished from all other groups having the anterior coxaj 

 prominent and the side pieces of the metathorax nurrow, by the 

 sixth ventral segment not being visible ; the fifth and propygidium 

 are closely connate, with the suture indistinct, and the spiracle is 

 placed midway between the anterior and posterior margins ; the 

 ventral sutures are distinct in all of our genera, and the apical 

 margin of the thorax is membranous, except in Alobus ; the 

 antennae are 10-jointed, except in Diazus. 



Anterior claws with a slightly prominent tooth near the tip : iniddle and 

 posterior claws cleft. Orsonyx. 



Claws alike on all the feet ; 



Last joint of maxillary palpi oval, somewhat pointed ; 



Antennae 9-jointed ; claws entire. Diazus 



Antennrc 10-jointed ; claws cleft or toothed. Diplotaxis 



Last joint of maxillary palpi elongate, cylindrical; claws witli a vrry 



large tooth. Alobus. 



