692 LIST OF DIPTERA. 



Gymnosoma par, n. s., mas. et fem. Fulva, abdominis mari. disco 

 thoraceque nigris, fem. abdomine maculis nigris ornato y antennis 

 fulvis, articulo 2° nigro, pedibus nigris, alis subcinereis, basi 

 flavis. 



Body black : head tawny, adorned with a gold lustre in the 

 male, with a silver lustre in the female, clothed behind and beneath 

 with hoary hairs : eyes red : feelers tawny ; second joint black, ex- 

 cept at the base beneath ; bristle tawny, black towards the tip: 

 chest clothed with short black hairs ; sides and breast hoary : abdo- 

 men tawny, thickly punctured, clothed with short black hairs, with 

 a black disk in the male, along the back of the female with a row of 

 large irregular black spots, which successively decrease in size from 

 the base to the tip : legs black, clothed with black hairs ; foot- 

 cushions pitchy: wings slightly gray, yellow at the base; wing- 

 ribs and veins tawny ; veins pitchy towards the tips ; scales yellow- 

 ish white; poisers bright tawny. Length of the body 2j — 2f 

 lines ; of the wings 4 — 4-t lines. 



a. Nova Scotia. From Lieut. Redman's collection. 



b. -? 



Gymnosoma occidua, n. s. Nigra, pilis cinereis veslita, capite albo, 

 abdomine subtus et segmentorum 1° et 2° marginibus posticis f al- 

 ms, sequentium marginibus posticis utrinque viitaque dorsali ca- 

 nis, antennis pedibusque nigris, alis subcinereis. 

 Body black: head white, clothed behind with a few black 

 hairs ; a black stripe extends from the eyelets to the base of the 

 feelers, and there is a tawny tinge on each side of it: eyes red: 

 sucker black, clothed with black hairs : feelers deep black ; third 

 joint longer than the second, flat above, convex beneath, rounded at 

 the tip ; bristle longer than the third joint : chest clothed with 

 short gray hairs : breast partly covered with hoary bloom : abdomen 

 shining, thickly punctured, clothed with short black hairs : under- 

 side and hind borders of the first and second segments tawny ; 

 hind borders of the following segments hoary on each side of the 

 back, which is also adorned with a hoary stripe : legs black, clothed 

 with short black hairs : wings slightly gray ; wing-ribs tawny ; 

 veins pitchy, tawny at the base ; scales white, with yellow borders; 

 poisers tawny. Length of the body 2\ lines; of the wings 4 

 lines. 

 a. Nova Scotia. From Lieut. Redman's collection. 



