104 lrptid;e. 



I'^yes in (J contiguous for a considerable 



distance; frons in 5 only as broad as [p. Itil. 



ocellar tubercle S(iragina, Walk., 



8. Frons and side-margins of face ( d" 5? ) dis- 



tinctly hairy. Atherix, Mg., p. 120. 



Frons in J and side-margins of face (c? 2) [p. 112. 



bare Ateichops, Verv., 



9. Anal cell ojien ; bind tibiae with two spurs . . Lkptis, F., p. 124. 

 Anal cell closed ; hind tibiae with one spur [p. 128. 



only Chrysopilus, Macq., 



Subfamily XYLOPHAGIN^. 



Eace flat, no socketed epistome margined by broad side-cbeeks. 

 Palpi long, curved upwards ; the 3rd antenual joint flagelliform, 

 generally divided by annulations into seven parts, but in JihacM- 

 cerus into many more. Eyes in cS distinctly separated, in $ 

 rather wider apart. Body and legs almost bare. Scutellum 

 smaller and metanotam more conspicuous than in normal Lep- 

 TiD^. Abdomen considerably elongated or cylindrical ; the male 

 genitalia rather complex, those of the 5 long and telescopic. All 

 tibi® spurred. Wings with auxiliary and 1st veins long, 2nd 

 shorter than in Leptin^, 3rd with fork rather short, widely open, 

 lower branch ending above or at wing-tip ; anterior cross-vein 

 very short, situated towards base of discal cell ; posterior cross- 

 vein exceedingly short or absent, anal cell normally closed at wing- 

 border ; axillary vein indistinct or absent; alulae absent. 



Life-ldstory. " Larva ampliipueustic, allied to those of CcEisO- 

 MYIN7E and LeptiNvE ; carnivorous ; living under the bark of dead 

 trees and preying upon other (probably dead) larvse occurring 

 there, especially those of wood-boring Coleoptera, or upon the 

 debris and detritus left by those larvoe " (Verrall). Birch, alder, 

 and pine are the trees mostly favoured. The imagos are usually 

 found about their breeding-{)laces in woods. 



Only one genus of this subfamily (Rhachicerus) occurs in India. 



Xylophagus, Xylomi/ia, and one or two other genera were for 

 many years regarded as a separate family, but the resemblance 

 between them is more apparent than real ; and^ Osten-Sacken, 

 who A'ery closely criticised Brauer's paper on the cliaracters of the 

 NoTACAi^THA (Berl. ent. Zeit. xxvi, p. 363), showed satisfactorily 

 tliat they {Xylophagus and Xylomyia) cannot both come in tlie 

 same ultimate subdivision. 



Genus RHACHICERUS, Wall: 



RhacMcerus, Walker, List Dipt. Brit. Mus. v, Supp. i, p. 10-3 (1854). 

 Y lihyphomorjiha, Walker, Proc. Linn. Soc. Lond. v, p. 275 (18(51). 

 Antidoxion, Snellen v. Vollenboven, Versl. Meded. Kongl. Akad. 

 van Wetensch. Afd. Natuurk. xv, p. 1 (1863). 



Genotype, Rhachicems fulvicolUs, Walk.; the original species. 

 " Body slender, nearly linear, cylindrical. Head transverse, 

 nearly as broad ivi tliorax, vertex narrow. Eyes large, with small 



