1893.] MB. E. E. AUSTEN OX NEW DIPTEEOITS ETSECIS. 135 



apical fourth of tlie first joiut of the posterior tarsi is yellowish 

 white like the remaining joints of this pair of tarsi! 



Baccili, F. 



The genus Bacclia seems to me at present to include at least 

 three distinct groups of species. Of Group I. the Eui-opeau 

 B. eloiujata, ¥., may be taken as a tj-pe ; the members of this group, 

 which are found in both the Old and New Worlds, are species 

 with pedunculate abdomens, more or less dark in colour, usually 

 varied with yellow markings, and hyahne or infuscated wiugs : 

 the alulae may or may not be rudimentary. 



Group II. is composed exclusively of Neotropical forms, in 

 which the abdomen is of a more or less ferruginous or ochra- 

 ceous colour, marked with a series of continuous longitudinal stx-ipes' 

 of a lighter tint, spatulate posteriorly and more or less contracted 

 at the base ; the dorsum of the thoi'ax is usually covered with 

 ochraceous pollen, aud marked with stripes ; the front bears a 

 pronounced antenniferous projection, marked with a round black 

 dot ; the wings generally have an ochraceous infuscation, and the 

 alulae are of the full size : of this group B. livicla, Schin., may be 

 taken as typical; B. conjimcta, Wied., is an aberrant form. 



Group III. at present also consists entirely of Neotropical 

 species, the characteristics of which are a broad, flat abdomen, 

 which is not contracted basally, but expands regulai'ly to the end of 

 the fourth segment, and is of a moi^e or less ferruginous or yellowish 

 colour, which is divided up by brown bauds, &c., into broad and 

 generally notched markings ; infuscated wings, with the third 

 longitudinal vein straight, or somewhat concave posteriorly, and 

 rudimentary alulae ; there is also a small antenniferous process, 

 marked with a round black dot: the shape and colour of the 

 abdomen are thus the most striking features of this group, of which 

 the species described below as BaccJia crocaia may be taken as a 

 type. The only pre\iously described species which I can assign to 

 this group is B. luctuo&a, liigot (Ann. Soc. Ent. Pr. ] 8S3, p. 334), 

 from Mexico. 



Of the species here desci'ibed, all those from the Oriental and 

 Australian Regions, as well as B. siipiiftra, levissima, incompta, 

 and pumila, from Brazil, and B. scujittifera, fi'om Jamaica, belong 

 to Group I. B, ampJiithoe, AVlk., from the Oriental Region, aud 

 B. hifjoti (nom. nov.), from Brazil, also belong here. 



Of Group II. the only species here described is B. silacea, from 

 Brazil. Specimens of several other species, which are doubtless 

 new and certainly belong to this group, are in the Collection, 

 but are not in a sufficiently good condition to describe. 



To Group III. belong B. callrata^ jlavens, </ilva, crocata, aud 

 crocea. B.fervida also belongs here, but has full-sized alula). 



I think there is no doubt that the genus Baccha as it now exists 

 ought to be split up ; and, while I do not venture to undertake the 

 task myself at present, I have endeavoured to indicate a way in 

 which perhaps it might be done. It seems inconsistent to place 



