BY ARTHUR WHITE. 253 



Arachnomyia arborum, Sp. nov. (Fig. 50). 



Thorax bronze, with a bright green median stripe; ab- 

 'domen dark bronze ; legs entirely yellow ; wings hyaline. 



Length. Male, 6 mm. 



Hab. Bagdad Valley. 



Male. Face snow-white; proboscis dark brown; palpi 

 light orange ; there is a fringe of short white postocular 

 iDristles, and the lower part of occiput bears dense white 

 hairs; vertex with long black bristles. Thorax bronze, 

 with a median stripe of bright green, which does not reach 

 as far as the scutellum ; thoracic bristles black ; scutellum 

 bronze, with two very long, black, nearly-upright, marginal 

 bristles. Abdomen bare, dark bronze, with ruddy reflec- 

 tions; genitalia very large, nearly globular, and raised far 

 above the dorsum. Legs remarkably long and slender, 

 light yellow, c^uite bare of pubescence or bristles, except for 

 one black bristle about the middle of the posterior tibiae ; 

 the middle legs the longest, the tarsi longer than the 

 tibiae ; the anterior tarsi have the fii^t joint the longest, 

 the middle tarsi the second joint the longest; in the pos- 

 terior tarsi I am unable to make out any articulation be- 

 tween what should normally represent the fii'st and second 

 joints, consequently the basal joint is of immense length. 

 Wings hyaline. 



This species frequents tree-trunks in the bush. The long 

 legs seem an adaptation to its mode of life, and is a similai" 

 development to that found in certain species of the families 

 Dexidce and Micro pezidce which have similar habits. It 

 occurs during January, but seems to be generally scarce. 



62. DiAPHORUs, Meig. 



Eyes of the male touching on the front ; antenna with 

 arista dorsal ; wings broad, with the cubital and discal 

 veins almost parallel. 



Head as broad as, or a little broader than, the thorax; 

 the vertejj: not excavated. Eyes joined above the antennas 

 in the male, separated in the female. Antennae with the 

 three joints all short, the third rounded, and bearing a 

 long dorsal arista, which is microscopically haired. Thorax 

 metallic, but of rather dull appearance ; acrostichal 

 bristles biserial, and there are also five dorsocentral, one 

 humeral, one posthumeral, two notopleural, three 

 supraalar, and one postalar bristle. Abdomen short, with 

 iiindmarginal bristles; apex in male with four blunt 



