GONIA. 13 



Corpus robustum. Caput tumidum. Facies verticalis. Arista geni- 

 culata, articulo secundo longo. Ungues et onychia minuta. 

 Body stout. Head tumid. Face vertical. Antenna reaching the 



epistoraa ; third and fifth joints very long ; sixth bare, forming an angle 



with theffth. Ungues and onychia small. 



The British species also agree in the following characters : 

 Black. Head large, tawny, covered with shining white tomentum, 

 thickly clothed beneath and behind with tawny hairs ; front more pro- 

 minent in the male than in the female ; frontalia broad ; face rather 

 deeply concave ; facialia bristly along rather more than half the length ; 

 epistoma slightly prominent ; mediana luteous ; eyes bare ; palpi tes- 

 taceous. AntennaB reaching the epistoma ; third joint slender, linear, 

 rounded at the tip, more than four times longer than broad ; fourth 

 very short ; fifth very little shorter than the sixth ; sixth short, stout, 

 forming an angle with the fifth. Thorax covered with brownish to- 

 mentum, which is interrupted by four slender irregular black stripes. 

 Costal vein terminating considerably above the tip of the wing, a little 

 beyond where the prsebrachial meets it ; subcostal vein ending beyond 

 one-third of the length, mediastinal vein ending beyond half the length 

 of the costa ; radial vein ending at four-fifths of the length ; cubital 

 vein ending very near the tip of the prasbrachial ; prabrachial vein 

 forming an obtuse angle at its flexure, near which it is very slightly 

 curved inward, and thence continues almost straight to its tip ; discal 

 transverse vein with two very slight curves, parted from the border by 

 very little less than its own length. Alula? white, very large. Abdo- 

 men subovate, slightly tessellated with white tomentum. Ungues 

 tawny at the base. Onychia pale testaceous. 

 a. Abdomen tawny on each side. Species 1. 

 a a. Abdomen black on each side. Species 2. 



1. capitata, D. G. I. vi. 23. 12. 2. pi. 1. f. 3 (1763) ; Fal.; Meig.; 

 Desv.; Mcq. ; Curt.; Zett. ornata, Meig. vittata, Meig. divisa, 

 (Meg.) Meig. vacua, Meig. auriceps, Meig. ; Curt. vernalis, Desv. 

 bombylans, Desv. melanura, Desv. Antennis basi fulvis, scutello et 

 nonnunquam thoracis lateribus ferrugineis, alis subcinereis, abdominis 

 lateribus basi ad medium rufo-fulvis. Long. 4^-5^; alar. 8-11 lin. 



First and second joints of the antennas tawny ; third tawny at the 

 base. Scutellum, and frequently the sides of the thorax, ferruginous. 

 Wings slightly grey ; veins black, testaceous at the base. Abdomen 

 reddish-tawny on each side from the base to the middle. Male. Frontalia 

 buff. Fern. Frontalia luteous. 



Not rare. (E.) 



2. ruficeps, Fin. Msc. 4. 3 (1810); Meig.; Curt.! B. E. 533; 

 Zett. -fasciata, Meig. Scutello piceo, alis cinereis, abdominis segmen- 

 tonim marginibus anticis albo-tomentosis. Long. 5 ; alar. 10 lin. 



Frontalia ferruginous or brown. Scutellum piceous. Wings grey ; 



