OF NATURAL HISTORY. 7 .',7 



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

 at base of the second segment of the tergum. 



Judging from memory, as in the preceding iustAncc, I supptji^e 

 this to be the /usripniu is Beauvois, but not that of Fabriciua, for 

 the reasons there adduced. I may also .state that thi.s Hpocics 

 does not correspond with Fabricius' description in having " ala 

 nigrae cyaneo parum uitidai," neither does it agree with " I'edcs 

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

 tially white. 



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

 very reflection : a prominent, acute carina between the ant<.-nnac, 

 divaricating above the antennae into two carinsc : antennas emar- 

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

 of dusky at tip : t«rgum gradually attenuated to the base ; three 

 first incisures a little contracted j feet, anterior pair of knee*, 

 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 licad and the cmarginate an- 

 tennae. It is much smaller than the jifful us ¥., and its abdomen 

 is formed as in that species. 



OXYBELUS Latr. 



1. 0. EMAROiNATUS. — % Black; srutellar spine emarginate ," 

 tergum 4-spotted. 



Inhabits Indiana. 



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

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

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

 widely emarginate at tip. and a lateral sublanceolatc, decur^'cd, 

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

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

 side; second segment al.^^o with a similar line: tarsi pale honey- 

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

 pair black, yellow at base. 



Length throe-twentieths of an inch. 

 1837. ■) 



