OP NATURAL HISTORY. 757 



Var. a. Terminal joints of the tarsi blackish; a yellow band 

 at base of the second segment of the tergum. 



Judging from memory, as in the preceding instance, I suppose 

 this to be the fuscipennis Beauvois, but not that of Fabricius, for 

 the reasons there adduced. I may also state that this species 

 does not correspond with Fabricius' description in having " alse 

 nigrae cyaneo parum nitidae," neither does it agree with " Pedes 

 nigri tarsis albis " inasmuch as the posterior pair only are par- 

 tially white. 



3. T. CARINATUS. — % Black : head and stethidium with sil- 

 very reflection : a prominent, acute carina between the antennae, 

 divaricating above the antennae into two carinae : antennae emar- 

 ginate beneath towards the middle : wings hyaline : a slight tint 

 of dusky at tip : tergum gradually attenuated to the base ; three 

 first incisures a little contracted ; feet, anterior pair of knees, 

 tibiae and tarsi yellowish ; intermediate knees and tarsi yellowish 

 in the middle above dusky ; posterior tarsi obscurely yellowish 

 towards the tip. 



Inhabits Indiana. 



Length three-tenths of an inch. [375] 



Remarkable by the carina of the head and the emarginate an- 

 tennae. It is much smaller than the figulus^., and its abdomen 

 is formed as in that species. 



OXYBELUS Latr. 



1. 0. EMARGiNATUS.— S Black J scutellar spine emarginate ; 

 tergum 4-spotted. 



Inhabits Indiana. 



Body black, with a slight silvery reflection, particularly on the 

 anterior part of the head : antennae dull yellowish at tip : wing- 

 scale honey-yellow : wings hyaline : scutel with a dilated process 

 widely emarginate at tip, and a lateral sublanceolate, decurved, 

 acute, white one ; tergum, first segment with a longitudinal, in- 

 dented line, and a transverse, abbreviated, white line at tip eaxsh 

 side; second segment also with a similar line: tarsi pale honey- 

 yellow: anterior thighs yellow at tip: tibijc yellow; posterior 

 pair black, yellow at base. 



Length three-twentieths of an inch. 

 1837.1 



