Cutiterebra and its Allies in the British Museum. 383 



tuft of yellow pile on the pleurce in front of the base of the 

 wingsj entirely clothed with black hair: abdomen shining 

 plum-purple*, the anterior margins of the third and fourth 

 segments narrowly yellowish pollinose; in the case of the 

 third segment there is an expansion of this narrow band on 

 each side, so as to include the posterior margin of the pre- 

 ceding segment, and there are indications that the band at the 

 base of the fourth segment is similarly expanded at the sides ; 

 the sides of the first four segments below and the whole upper 

 surface of the fifth sprinkled with the usual irregular 

 markings of yellowish pollen, leaving connected or isolated 

 dots of the shining ground-colour. Legs : tarsi large and 

 broad; last two pairs of femora with a patch of yellowish 

 pollen at the base in front. Wings broader than in C. ameri- 

 cana, F., 7^ millira. in width at their broadest part, some- 

 what paler towards the base on the inner side. 



Prof. Brauer (* Monographic,' &c. p. 245) states that he 

 regards C. terrisona as a synonym of C. americana, F., and 

 that he cannot understand how Walker could separate it ; on 

 this account Walker's species is definitely referred to 

 C. americana by van der Wulp (Biol. Centr.-Amer., Diptei-a, 

 vol. ii. p. 1). C. terrisona is, however, a perfectly good 

 species, which can at once be distinguished from C. americana 

 by the pleurge being entirely clothed with black pile, except 

 the small fleck of yellow hair, and by the absence of the 

 jagged yellow pollinose border to the cheeks in the female. 



Cutiterebra americana, F. 



Cuterebra americana, Fabricius, Syst. Eiit. 774, 6 (nee Walker, List 

 Dipt. &c. iii. p. 683). 



Two specimens, both females — one labelled " Georgia," the 

 other without a locality. In his description Fabricius 

 writes, " thoracis lateribus canis : " in these specimens the 

 pleurge are clothed with cadmium-yellow pile, but herein they 

 agree with Prof. Brauer's description of the species (' Mono- 

 graphic,' &c. pp. 243-244) and also perfectly with Bracy 

 Clark's coloured figure of his species G. cauterium (' An 

 Essay on the Bots of Horses and other Animals,' London, 

 1815, p. 70, pi. ii. fig. 28), which is regarded by Brauer as a 

 synonym of G. americana, F. The colour of the pile 

 clothing the pleurae is probably variable. In these specimens 

 the contrast between the yellow pleurae and black dorsum is 

 very sharp, and with the polished deep purple abdomen and 

 uniformly deep brown wings renders the species a strikingly 



* Ridgway, 'Nomenclature of Colours,' pi. viii. 



