66 ACADEMY OP NATURAL SCIENCES 



6. D. CRUCIATUS. — Thorax margined and spotted with yellow, 

 abdomen black, annulate with yellow. 



Inhabits Arkansa. 



Hypostoma yellow; stethidium black; thorax broadly margined 

 with yellow, a humeral triangular [53] spot and a spot each side 

 of the middle connected by a line with the margin, yellow; wings 

 ferruginous, nervures like those of the preceding species ; feet fer- 

 ruginous; pleura spotted with yellow; abdomen black, segments 

 with a broad yellow posterior margin. 



Length nine-tenths of an inch. 



A large and fine species, very readily distinguished from others. 



Genus LAPHRIA Fab. Latr. 



1. L. FULViCAUDA. [Ante, 1, 12.] 



2. L. GLABRATA. — Black, polished; posterior edges of the seg- 

 ments of the tergum white. [5^] 



Inhabits the United States. 



Body with very short prostrate, indistinct hair, punctured ; 

 hypostoma silvery ; tubercle of the vertex brown ; occiput plum- 

 beous ; collar and line upon the thorax each side before the wings 

 cinereous; pleura and pectus with a cinereous reflexion; wings 

 immaculate, nervures brown, nearly resembling in their arrange- 

 ment Meigen's fig. 20, pi. 20 ; poisers whitish; feet reddish-brown, 

 the middle of the thighs, tips of the tibia and tarsi darker, pos- 

 terior feet beneath densely hairy; the basal and terminal segments 

 destitute of the white edge. 



Length one-fourth of an inch. 



Var. a. Feet pale. 



I have a specimen in which the external branch of the termi- 

 minal furcate nervure is continued a short distance beyond its 

 connexion, as in Meigen's fig. 23. The antennas of this species 

 are like those of Dioctria ^-punctata, excepting that they are 

 acute at tip, and the arrangement of the nervures, decides the ge- 

 neric affinity of this insect. 



[Belongs to Atomosia Macq. — Sacken.] 



[Vol. III. 



