1893.] MK. E. E. AUSXEN OK NEW DIPTEROUS IlfSECTS. 135 



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

 white like the reinaiuing joints of this pair of tarsi. 



Bacchlv, F. 



The genus BaccJia seems to me at present to inclade at least 

 three distinct groups of species. Oh" Group I. the European 

 B. elowjata, P., may be taken as a type ; the members of this group, 

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

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

 varied with yellow markings, and hyahne or infuscated wiugs : 

 the alulffi 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 stripes 

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

 at the base ; the dorsum of the thorax is usually covered with 

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

 pronounced antenniferous projection, marked with a round black 

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

 aluljB are of the full size : of this group B. livida, Schin., may be 

 taken as typical ; B. conjuncta, 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 regularly to the end of 

 the fourth segment, and is of a more or less ferruginous or yellowish 

 colour, which is divided up by brown bands, &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 Baccha crocata may be taken as a 

 type. The only previously described species which I can assign to 

 this group is B. luctuosa, Bigot (Ann. Soc. Ent. Fr. ] 883, p. 334), 

 from Mexico. 



Of the species here described, all those from the Oriental and 

 Australian Regions, as w^ell as B. signiftra, levissima, incompta, 

 and pmnila, from Brazil, and B. scif/ittifera, from Jamaica, belong 

 to Group I. B. amj^hitlioe, Wlk., from the Oriental Region, and 

 B. hinoti (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. cultmta, flavens, gilva, crocata, and 

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



I think there is no doubt that the genus BaccJia 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 



