148 Mr. E. E. Austen on Cutiterebra. 
parallel with the narrow oblique tuft of yellow pile before 
the base of the wings, the type of atrox shows a broader bare 
mark covered with yellowish pollen; this is also visible in 
the type of terr7sona, and again, though faintly, owing to the 
bad state of preservation, in the ‘ Biologia’ specimen which I 
referred to that species in my former paper. In the latter 
specimen, by the way, which is apparently also a male, three 
triangular flecks of yellow pollen are faintly visible, resting 
on the lower part of the inner margin of each eye. The 
dimensions of the type of C. atrox, Clk., agree very closely 
with those given in my previous paper (p. 382) for the type 
of C. terrisona, Walk.; the vertex, however, is slightly 
narrower. Since C. atroxz was described in 1848, while the 
description of C. terrisona was not published until the 
following year, Clark’s name has the priority. The syno- 
nymy will therefore run as follows :— 
Cuttterebra atrox, Clk. 
Cuterebra atrox, Clark, Addenda 1848, fig. 5; Brauer, Monographie 
der Cistriden, pp. 241, 242 (1865). 
Cuterebra terrisona, Walker, List Dipt. Ins. in Coll. British Museum, 
iii. p. 683 (1849); Brauer, Monographie der Cistriden, pp. 244, 245 
(1863); Austen, Ann. & Mag. Nat. Hist. ser. 6, vol. xv. pp. 382, 383 
(1895) [ Cutiterebra}. 
Cuterebra approximata, vy. d. Wulp, p.p. (nec Walk.), Biol. Centr.- 
Am., Diptera, vol. ii. p. 2 (1888). 
On comparing the types of Cutiterebra atrox, Clk., C. ap- 
proximata, Walk., and C. funebris, Austen, I find it possible 
to tabulate the specific differences as follows :— 
Black species (abdomen metallic, either plum-purple or greenish black), 
clothed with black hair, either entirely or with the exception of a tuft ot 
yellow pile on the pleure. 
I, Pleurze with narrow oblique tuft of yellow pile 
in front of base of wings; margins of abdominal 
segments narrowly yellowish pollinose........ atrox, Clk. 
II. Pleurze clothed entirely with black pile; margins 
of abdominal segments not yellowish pollinose. 
a. Abdomen greenish black; a round shining 
black tubercle on each cheek; tarsi very 
broad: late species | 2/6. seed ae SO funebris, Austen. 
6. Abdomen dark violet or plum-purple ; cheeks 
rugose, but with no tubercle ; front pair of 
tarsi, at any rate, scarcely more than half the 
width of the corresponding pair in C.funebris : 
MeCIUM-SIZEd SPECIES”. 5 an vs sianlie oe etem BN approximata, Walk. 
