of (he Family Tabanidge. .3G3 



■with a tooth ; tlic h)ng slciulcr alKlomcn with y('lh)\v bands 

 or spots, the wings marked with brown, and the whitish tibiae 

 or tarsi seem typical of tlie genus, at least for all the s])ecies 

 as yet described. 



There are five species known, all from South America : — 



A. lonrjicorms, $, Fabr., Ent. Syst. iv. p. 371 (1794); id. Syst. Autl. 

 p. 103 (180o) {Tabnnus) ; Wiedem., Dipt. Exot. i. p. 98 (1821); id. 

 Au.s3. zweifl. Ins. i. p. 213 (1828) {Ihematopota) ; id. Ilist. Nat. Dipt, 

 i. p. 209 (1834) ; Macq., Dipt. E.vot. i. p. 114, pi. xvi. fig. 2 (1838) 

 (Dichelacora); Wallcer, List Dipt. pt. v. Siippl. 1, p. 267 (1854). 



tllcematopota triangularis, Wiedem., Zool. Mag. iii. p. 44 (1819).] — 

 }razil. 

 A. exstiticfa, $, Wiedem., Auss. ztveifl. Ins. i. p. 214 (1828); Walker, 



Li.st Dipt. pt. V. Suppl. 1, p. 208 (1854); Loew, Dipt. Siidafrik. 



p. 46 (I860).— Montevideo. 

 A. coarctata, $ , ^\'iedem., Au.ss. zweifl. Ins. i. p. 578 (1828) ; Walker, 



List Dipt. pt. V. Suppl. ], p. 295 (1854) {Hcematopota) ; Bigot, Bull. 



Soc. Zool. Fr. xvi. p. 74 (1890).— Brazil. 

 A. inarginalis, cS , Walker, List Dipt. pt. v. Suppl. 1, p. 2G8 (1854). — 



Brazik 

 A. trigonifera, $, Schiner, Reiae Novara, p. 95 (1866). — .South America. 



1. Species with the tooth of the third joint of 



the antennae small 2. 



Species with the tooth of the third joint of 



the antennaj long 3. 



2. Abdomen constricted at the base. , coarctata, 2, Wiedem. 



Abdomen not so constricted exstincta, 5 , Wiedem. 



3. Wings black-brown, a clear spot in the 



middle, but no clear space between the 



apex and the aual cell trigonifera, 5 , Schiner. 



Wings with brown markings, the space 



between the apex and the anal cell clear. 4. 



4. Wings with a dark band across the middle, longicornis, 9, F. 

 Wings with no such dark band marginalis, ^ $ , ^Vlk. 



Acanthocera coarctata, ? , "Wiedem, 



Probably belongs to this genus, as Wiedemann states it 

 belongs to the group comprising^, lonf/icornis and A. exstincta, 

 the tooth of the third joint of antennae being more like that 

 of the last-named species, of w hich he suggests it might be 

 the other sex, yet he speaks of both the species as females 

 oidy. 



Acanthocera marginalis, ^ ? , Walker. 



One female type from Para, Brazil (Bates Coll.), 51. 147; 

 one male from Kiver Amazons, Brazil (Bates Coll.), 66. 53; 

 one female from same locality (Saunders Coll.), 73. 34; one 

 female, Ega, lliver Amazons (Bates Coll.), 66. 53. 



This species cannot be identical with A. exstincta, Wiedem., 



25* 



