286 F- W. EDWARDS. 



spiracle, of a row of yellow bristles.* These bristles are quite apart from the usual 

 pro-epimeral bristles, which are present in Theohaldia but somewhat reduced in length, 

 their place being largely taken by the spiracular bristles, which are placed in a close- 

 set row on the posterior side of the posterior ridge of the pro-epimeron. As in 

 Orthopodomyia, there are no post-spiracular bristles. 



The African species, Leptosomatomyia fraseri, shows the same pleural and hypo- 

 pygial characters as Theobaldia, and ^should probably be included here. Apart from 

 this, the genus is practically confined to the temperate regions of the northern 

 hemisphere, three species occurring in the Punjab. 



The larvae are sharply distinguished from others in the Palaearctic fauna 

 (except Megarhinns) by the basally situated hair-tuft on the siphon. 



Three subgenera {Theohaldia, Culicella and Allotheohaldia) are sharply defined 

 by larval structure, but the distinction in the adults is not so clear, and it will therefore 

 be best to tabulate all the species together, while admitting the subgenera as vaUd. 

 I agree with Brolemann that Culicella is not generically separable from Theohaldia. 



Adults. 



1 . Thorax with rather sharply defined white lines ; femora and tibiae 



striped and spotted ; costa largely pale-scaled ; male palpi shorter than 

 the proboscis (subgenus Allotheohaldia) .. .. longiareolata, Macq. 



Thorax without sharply defined white lines ; femora and tibiae not 

 striped ; costa all dark ; male palpi longer than the proboscis . . 2 



2. Cross-veins in a straight line, or nearly (subgenus Theohaldia) . . . . 3 

 Cross- veins well separated ; tarsi with narrow pale rings embracing both 



ends of joints ; wings not distinctly spotted (subgenus Ctdicella) . . 6 



3. Tarsi entirely dark ; wings not distinctly spotted . . glaphyroptera, Schin. 

 Tarsi broadly ringed with white at the bases of the joints ; wings more 



distinctly spotted (at least in the female) by accumulation of scales at 

 the bases of the fork-cells and on the cross-veins 4 



4. Femora without pale pre-apical ring ; hind metatarsi without white ring 



in the middle . . . . . . • • • • ■ • alaskaensis, Ludlow. 



Femora with pale pre-apical ring ; hind metatarsi with white ring in middle 5 



5. Wing-spots distinct ; abdomen conspicuously banded with black and 



white . . . . . . • . • • • • • • • • anmdata, Schrank. 



Wing-spots indistinct, especially in the male ; abdominal scales nearly 

 all ochreous subochrea, Edw. 



6. First joint of front tarsi of male longer than the remaining joints 



together ; proboscis of female almost entirely black . . morsitans, Theo. 

 First joint of front tarsi of male not longer than the remaining joints 

 together ; proboscis of female with many pale scales at the sides and 

 beneath . . . . . • • • • • • • ftmiipennis, Steph. 



Male Hypopygia. 



1. Ninth tergite with a pair of long processes ; aedoeagus remarkably large 



and complicated loyigiareolata, Macq. 



Ninth tergite without distinct processes ; aedoeagus normal . . . . 2 



2. Clasper somewhat swollen at the tip ; side-piece with asubapical projection 



bearing a number of long, flattened appendages . . glaphyroptera. Schin. 

 Clasper not swollen at the tip ; side-piece otherwise 3 



3. Side-piece with a more or less distinct, hairy subapical knob . . . . 4 

 Side-piece without subapical knob or agglomeration of hairs . . . . 5 



* This character is also possessed by Megarhinus, Psorophora and some Sabethine genera 

 {e.g., Rachionotomyia), but none of these could well be confused with Theobaldia. 



