1906.] MISS G. RICARDO OX A NEW SPECIES OF FLY. 97 



in which he describes two fully adult living specimens. He says : — 

 "The two living specimens, which are now under my inspection, 

 show that my former description was taken from very yoimg 

 specimens of about half their full size, and that this northern 

 species comes much nearer in size to the southern species 

 (DoUchotis patagonica) than I was formerly led to suppose." 



It is now quite clear from specimens collected by Mr. P. 0. 

 Simons in 1901, and described by Mr. Oldfield Thomas, that the 

 living specimens described by Dr. Burmeister in his second paper 

 were Dolichotis magellanicus centricola and not DoUchotis salinicola, 

 and that those described in his first paper were full-grown or 

 nearly full-grown specimens of the dwarf species Dolichotis scdini- 

 cola, which I have now alive in my possession. 



Both these species occur in the same region near Santiago del 

 Estero in Northern Argentina, so that confusion was easy. 



The common Patagonian Cavy is conspicuous for a broad dark 

 band above the white rump-patch. This black band is wanting 

 in Dolichotis salinicola and also in the larger Dolichotis magellanicus 

 centricola. 



EXPLANATION OF PLATE IV. 



Dolicliotis salinicola. 



3. Description of a new Fly of the Family Tabanidce. 

 By Gerteude Ricardo, 



[Received December 7, 1905.] 



Melissomorpha, gen. nov. 



Formed for a fly from Rungaroom, Sikhim, in the British 

 Museum Collection, which closely mimics Apis clorsata F., an 

 Indian species. 



The genus belongs to the Pangonince division of the family 

 Tabanidcf, which is distinguished by the hind tibiss being furnished 

 with spines, ocelli usually present, and the third joint of the 

 antennse consisting of eight divisions, with no tooth. 



This genus will come under No. 9 in my table of genera of 

 Pangonince in the Ann. Mag. Nat. Hist. (7) v. p. 98 (1900): 

 " Proboscis scarcely extending beyond the palpi," which dis- 

 tinguished Apatolestes, a North American genus. The two genera 

 may now be divided thus : — 



Having the appearance of a Bee (Apis). All the tibiaj wide 

 an d flattened Melissomorpha, gen . noy . 



Not having the appearance of a Bee. The tibiae not wide and 

 flattened Apatolestes Will. 



Melissomorpha, gen. nov. 



Generic clescrijMon. — Antennfe eight- jointed, ocelli present^ 

 Proc. Zool. Soc— 1906. Vol. I. No. Yll. 7 



