206 DIPTEEA. 



The following species of Erax have been described by the older authors from our 



region : — 



Erax affinis, Bell. Saggio &e. ii. p. 41. — Mexico, Cordova. 



aper, Walk. List &c. vii. p. 621. — Mexico. 



argyrogaster, Macq. Dipt. Exot. Suppl. i. p. 84. — Mexico, Yucatan. 



bicolor, Bell. 1. c. p. 47. — Mexico. 



bimaculatus, Bell. 1. c. p. 45, t. 2. f. 11. — Mexico. 



carinatus, Bell. 1. c. p. 36, t. 2. f. 9. — Mexico. 



cingulatus, Bell. 1. c. p. 42. — Mexico, Cuantla. 



comatus, Bell. 1. c. p. 34. — Mexico. 



eximius, Bell. 1. c. p. 38. — Mexico. 



jlavofasciatus^iedem. Aussereur. zweifl. Ins. i. p.470. — Brazil (Wiedem.) ; 



Honduras (Walk. List &c. ii. p. 400). 



lascivus, Wiedem. 1. c. i. p. 474. — Brazil (Wiedem.) ; Honduras (Walk. 1. c). 



Syn. Asilus amarynceus, Walk. List &c. ii. p. 400 ; ibid. vii. p. 637. 



loewi, Bell. 1. c. Append, p. 24, t. 3. f. 17. — Mexico, Tuxpango. 



marginatus, Bell. 1. c. p. 46. — Mexico, Cuantla. 



bellardii, Schin. Beise d. Novara, Dipt. p. 182.— Colombia. 



Syn. Erax (Eristicus) nigripes, Bell. 1. c. p. 48. — Mexico. 



parvulus, Bell. 1. c. p. 35, t. 2. f. 8.— Mexico. 



pumilus, Walk, List &c. vii. p. 640. — Mexico, Vera Cruz. 



4,-maculatus, Bell. 1. c. p. 44, t. 2. f. 13. — Mexico, Playa Vicente, Cordova. 



tricolor, Bell. 1. c. p. 40, t. 2. f. 12.— Mexico. 



unicolor, Bell. 1. c. p. 37. — Mexico, Tuxpango. 



PKOCTACANTHUS. 



Proctacanthus, Maequart, Dipt. Exot. i. 2, p. 120 (1838). 



I have three species of this genus before me. One from San Geronimo, Guatemala 

 (Champion), is represented by a single female, not unlike P. brevipennis in colouring, 

 but larger ; the femora and tarsi black ; the tibise red, black at the tip ; the palpi red, 

 beset with pale yellow hairs, and apparently unusually large ; the lips at the end of the 

 proboscis also more developed than usual. Another species, represented by four males 

 from Northern Sonora (Morrison), is allied to P. milbertii : I do not venture to describe 

 it, as I have no specimens of the latter for comparison ; it is larger than P. craverii, 

 Bell., and the tibiae are as dark as the femora. The third species I describe as new ; it 

 is very peculiar, and will, I hope, be easily recognizable. 



l. Proctacanthus exquisitus, sp. n., <$ $ . (Tab. III. fig. 12, $ .) 



Pale yellowish-grey ; abdomen with a longitudinal brown, well-marked stripe strongly contrasting with the 



pale ground-colour. 

 Length, $ , 19-20 millim. ; $ , including the ovipositor, 25 millim. 



Mab. Mexico, Northern Sonora (Morrison). 



