DESCRIPTION. 



Head black ; terminal joint of the antennse, 

 excepting the seta, and palpi, pale: stethidium 

 blackish (in the female pale testaceous, with 

 obscure lineations): thorax with two obsolete 

 cinereous lines, and a pale humeral spot: scutel 

 and powers pale-yellowish : wings hyaline, costal 

 margin tinged with testaceous, nervures brown : 

 feet pale testaceous, coxx, tarsi, half of the pos- 

 terior thighs, and posterior tibia, black (coxae of 

 the female colour of the stethidium) : tergum 

 yellowish, segments each with a fuscous or 

 blackish spot above, and a line on the lateral 

 edge ; the dorsal spots of the posterior segments 

 are extended into bands : venter blackish on the 

 terminal joints. 



OBSERVATIONS. 



This species, as well as the albicornis, belongs 

 to Meigen's first division of the genus, in which 

 the palpi are elongate-conic, and incumbent on 

 the proboscis. It resembles the albicornis, but 

 the wings are immaculate, &c. 



The lower left figure. 



PLATE XIII. 



