OF NATURAL HISTORY. 681 



mouth white : thorax black, with a white collar and wing-scale : 

 wings hyaline, nervures fuscous : tergum^ on the basal half, white, 

 with three dilated black bands slightly interrupted in the middle; 

 terminal half somewhat fulvous, with about two marginal black 

 spots and a larger double one each side near the tip ; lateral pro- 

 cesses at tip obvious : pectus white : pleura with a dilated black 

 line : feet white ; intermediate tibiae and tarsi with a black line ; 

 posterior thighs tinged with honey-yellow ; their tibiae and tarsi 

 dusky or blackish. 



Length one-fifth of an inch. 



XIPHYDRIA Latr. 



1. X. MACULATA. — Abdomen black with seven lateral white 



spots. 



Inhabits Indiana. 



% Body black : head punctured on the front; with two small 

 spots above the antennae, anterior and inferior orbits extending 

 in a line behind the eye, base of the mandibles, and two lines 

 upon the vertex, white : thorax confluently punctured ; about 

 four short lines on the disk, white ; a white spot before the 

 wings: wings immaculate: [222] tergum with seven lateral, 

 emarginate, white dots : beneath, on the neck and pectus with a 

 few white spots : feet honey-yellow. 



Length over two-fifths of an inch. 



This is undoubtedly much like the X. camelus Linn., which, 

 however, is destitute of spots on the disk of the thorax, the wings 

 are clouded towards the tip, and there are but six lateral spots on 

 the abdomen, the ultimate segment being immaculate. 



2. X. BASALIS. — Black ; abdomen fasciate at base. 

 Inhabits Indiana. 



9 Body black, polished : mandibles and palpi white : thorax, 

 anterior segment glaucous on the posterior margin : wings hya- 

 line ; first cubital cellule confluent with the first radial, having 

 only a rudiment of the dividing nervure : abdomen, two basal 

 segments honey-yellow, more or less intermixed with black : feet 

 honey-yellow ; posterior tarsi and tibias black, the latter white at 

 base. ^ 



Length seven-twentieths of an inch. 



Found in the latter part of May. 

 1835.] 



