NEW SPECIES OF INSECTS. 25 



Antenna black, the two basal joints ferruginous. Eyes 

 black. Elytra naked, punctured, the fillet occupies the 

 middle of each elytron and is abbreviated at the base and 

 apex. Scutel black. Tibia fuscous. Less than the pre- 

 ceding insect. In its colour and appearance, except as 

 to 3i2;e, it resen^bles A\ Fit tat a. 



Order DIPTERA. 

 Genus DIOPSIS. 



Head furnished with two inarticulate, immoveable 

 horns. Eyes situated at the extremities of the horns. 

 Antennae small, placed beneath the eyes. 



D. brevicornis. Black, pedicels shorty not so long as 

 the interval between their bases. 



Inhabits Pennsylvania. 



Head rufous; vertex brown, thorax blackish, a little 

 blended with cinereous, a lunate impression on each side 

 before, an impressed band on the middle interrupted 

 on the back; and an impressed, angulated one behind. 

 Lateral spines short, black; posterior ones longer, rufous. 

 TVings fasciated with brown near the apex. Feet rufous, 

 thighs, and tibia towards the tips, blackish, anterior thighs 

 thickened. Poisers white. Abdomen black immaculate* 



Lengdi rather more than three- twentieths of an inch. 



Extremely rar^; I found but a single individual in 

 May last seated on a leaf of the Skunk Cabbage, {Potho9 

 Foetida) near the Wissahickon Creek a few miles from 

 this city. This insect will be considered as a most inte- 

 resting addition to the American Fauna. 



The insects above described I believe to be new, aC 

 least they arc not noticed m any book to which I have 

 access. 



