206 Miss G. Ricardo on 



Loew's paper did not take place till Sept. 27th, 1851, 

 whereas Walker's paper was published on June 3rd, 1851. 

 Tiiis latter author gives a very short diagnosis of the genus, 

 and does not mention the characteristic venation of the wing 

 — viz., the absence of the ambient vein of wing posteriorly, 

 and the failure of the veins to reach the hind border, or, if 

 they do so, they become very fine. Loew gives an ample 

 description of the genus in his Dipt. Siid-Afrik. 



Walker established the genus for two species from East 

 India, and, as far as I am aware, he does not mention it again 

 except in the Dipt. Brit. Mus., Suppl. 3 — a mere repetition. 

 On examining these two species, I find they belong to the 

 genus Dasytlirix^ Loew (which, as stated above, must give 

 priority to Walker's genus), and have nothing to do with the 

 genus Andrenosoma, Rondani. The genus Nusa, Walker, 

 must be no longer contused with Andrenosoma, to which it 

 bears no kind of resemblance. 



The confusion seems to have originated with Williston, 

 wlio, in Trans. Amer. Ent. Soc. Philad. xviii. p. 80 (1891), 

 sinks Nnsa under Andrenosoma, Rondani. V. d. Wulp, in 

 his Cat. Dipt. S. Asia (1896), places the two species of Nusa 

 under Rondani's genus, which was founded in 1856, and after 

 1896 Aldrich and other American authors give iV^wsa priority, 

 while the late Piofessor Hermann, in his Beitriige Kennt. 

 siidamerik.. Dipt. Fauna, p. 239 (1912), does the same, 

 making Nusa cequalis the type of the genus, and alluding 

 with approval to the figure of it in Ins. iSaundersiana. His 

 long notes on this genus under the name of Nusa will now 

 apply to Andrenosoma, which must take the place of Nusa 

 in Kertesz's Cat., and my species Nusa africana, and queens- 

 landiaiid tectamus, Walker, will be respectively Andrenosoma 

 species. 



The genus Andrenosoma, Rondani, is richest in species in 

 the Neotropical and Pala3arctic Regions ; only one species is 

 mentioned from the Oriental Region, viz., crassipes, Fabr., 

 from Sumatra. 



The genus Dasythrix, now Nusa, was formed for species 

 from S. Africa ; a few species are also recorded from Arabia 

 and S. America, one from 8. Europe, and one from Algeria. 



Table of Species in ths Oriental Region. 



1. Third joint of antennae not elongated 2. 



Third joint of antennae elongated . 3. 



2. Legs entirely blackish brown. Abdomen 



black, with tomeutose white spots at 



Bides cegualis, $ , Wlk. 



