696 MAJOR E. E. AUSTEN ON 1?HE 



well-developed subfemoral spiilia on tlie hind legis are priesent in 

 both sexes. ., 



Rhaphiorhynchus planiventris Wied. 



iniaphiorhynchus planiventris Wiedemann, Dipt. Exot. i. 

 p. 60, Tab. ii. Hg. 1(1821). 



Acanthomera orassipalpis Macquart, M6nl. Soc. roy. des Sc, 

 de I'Agric. et des Arts de Lille, Annee 1846, p. 43, Tab. i. 

 lig.3(1847). 



Acanthomera higoti Bellardi, Saggio di Ditterol. Messicaha, 

 Appendice, p. 16, Tav. iii. fig. 10 (1862). 



The specific identity of Acanthomera ctasaipalpi's Macq. and 

 A. higoti Bell, with llh. planiventris Wifed. Was recognized long 

 ngo by Baron 0. R. Osten Sacken (Biol. Centr.-Amer,, Diptera, 

 vol. i. p. 66 (1886)). 



The undermentioned s^ecimen^ oi lih. planiventris are in the 

 British Museum (Natural History) : — One 6 , David, Chiriqui, 

 Panama, and one $ , Bugaba, Panama, 800-1500 ft. — both col- 

 lected by Mr. G. 0. Champio7i, and determined by Osten Sacken 

 (loc. cit.) ; one $ , Provincia Sara, Santa Cruz de la Sierra, Bolivia, 

 February- April, 1904 {J. Steinhach). From the Bigot collection, 

 Mr. J. E. Collin has kindly presented the type of Acanthomera 

 a-assipalpis Macq. (a $ , stated by Macquart, loc. cit., to be from 

 Guatemala), and two additional $ 2 » iroia Chontales, Nicaragua, 

 all of which, with a $ of Pantophthalmus (Acanthomera) fi'auen- 

 feldi Schin. {vide supra, p. 565), were placed by Bigot above a 

 label inscribed " Acanthomera crassipalpis Macq., n. sp. $ ." 



In the Hope Department of the University Museum, Oxford, 

 this species is represented by three $ $ , of which two are from 

 Chontales, Nicaragua, 1870 {E. M. Janson), while the third is 

 simply labelled " America aeq." 



The Liverpool School of Tropical Medicine possesses a $ of 

 Jih. planiventris fi^om the 11, Amazons, Brazil, " on board 

 S.S. ' Hildebrand,' 25. ii. 1920, 6.30 p.m." {Dr. Clarke). 



All three Oxford specimens show the nymphal stage of the 

 usual species of Gamasid mite on the dorsal surface of the 

 abdomen ; in two instances, however, only a single parasite is 

 visible, while in the third case the nymphs number less than 

 a dozen. 



Genus Atopomyia*, nov. 



Dis'tinguish'ed, at least in S sex, from both Pantophthalmus 

 Thunb. iand lihaphiorhynclius "Wied. by the narrow, elongate 

 iha"pe of the body, and thfe form of the third (compound) segment 

 of thfe i^'ntenna. The lattei*, instead of its broader (proximal) 

 portion b'6irig moi-e or less abruptly truncate (or tapering quickly 

 to ii poilit), and bea,ring terminally a fine, setiform arista (as in 



• . * (JroTJ-os, sll-ange, extvaorcliiiary, yivia, a lly. 



