of the Family Tabatiidse. 363 



"with a tooth ; the long slender abdomen with yellow bands 

 or spots, the Avings marked with brown, and the whitish tibise 

 or tarsi seem typical of the genus, at least for all the species 

 as yet described. 



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



A. longicornis, 2, Fabr., Ent. Sj'st. iv. p. 371 (1794); id. Syst. Antl. 



p. 103 (1805) (Tabafius) ; Wiedem., Dipt. Esot. i. p. 98 (1821); id. 



Auss. zweifl. lus. i. p. 213 (1828) {Hcematopota) ; id. Hist. Nat. Dipt. 



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



(Dichelacera) ; Walker, List Dipt. pt. v. Suppl. 1, p. 267 (1854). 



[H(gmato2}ota tricmyuluris, Wiedem., Zool. Mag. iii. p. 44 (1819).] — 



Brazil. 

 A. e.vsthicta, 2) Wiedem., Auss. zweifl. Ins. i. p. 214 (1828); Walker, 



List Dipt. pt. V. Suppl. 1, p. 208 (1854); Loew, Dipt. SUdafrik. 



p. 46 (1860>— Montevideo. 

 A. coarcfata, J, Wiedem., Auss. zweifl. Ins. i. p. 578 (1828); Walker, 



List Dipt. pt. V. Suppl. 1, p. 295 (1854) {Hcematopota) ; Bigot, Bull. 



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

 A. marginalis, (S , Walker, List Dipt. pt. v. Suppl. 1, p. 268 (1854). — 



Brazil. 

 A. ti-igonifera, 5, Schiner, Reise Novara, p. 95 (1866), — South America. 



1. Species with the tooth of the third joint of 



the antennse small 2. 



Species with the tooth of the third joint of 



the antennae long 3. 



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



Abdomen not so constricted exstincta, $ , Wiedem. 



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



middle, but no clear space between the 



apex and the anal 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, $ , F. 

 Wings with no such dark band margi7ialis, j 5 , Wlk. 



Acanthocera coarctata, ? , Wiedem. 



Probably belongs to this genus, as Wiedemann states it 

 belongs to the group comprising^, longicoi'nis and A. exstincta, 

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

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

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

 only. 



Acanthocera marginalis, ^ ? , Walker. 



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

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

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

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



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



25* 



