DOLICHOPID.E. 



149 



outlet (vi. pi. xi. fig. 14-16). The first week in June they 

 changed into pupse, casting their skin. The head of the pupa 

 was armed with several points; the ends of the legs, in their 

 sheaths, somewhat detached from the body ; the thorax bearing 

 on each side, near the head, an S-shaped process, probably serving 

 for respiration in this stage (fig. 17, 18). Out of these pupa3 

 Dolichopus aneus proceeded in a little more than three weeks' 

 time. From this account, the transformations appear to be most 

 like those of the Empida, among the families of Brachycera 

 which have the pupa stripped of the old skin ; the head of the 

 larva being variable in form, and destitute of jointed appendages : 

 see the transformations of RJiamphomyia spinipes, figured by 

 Bouche ('Naturgeschichte/ pi. 4. fig. 26-30). 



SYNOPTIC TABLE OF THE GENERA. 

 incurved, unguiculated ......... , ...... . . 15. APHROSYLUS. 



rforked ............. ;* ;./<- ...... 1. PSILOPUS. 



,2 co 



nearly unarmed ...... . . .'".'* .- T . . 14. MEDETERUS. 



'H i ( verv s ^ ort an< * rounded ......... 13. CHRYSOTUS. 



tapering to a point: f S raduaU y enlar S ed RHAPHIUM. 



bruptly enlarged . . , 9. MACH^RIUM. 

 near the hind margin of the wing .......... 5. HYDROPHORUS. 



f very narrow . . . .6. CAMPSICNEMUS. 



| 

 ' 



"S) 



Face 



broad 7. THINOPHILUS. 



conical or com- f distant on the front 1L P ORPHYROPS. 



of the male [ meeting on the front 12 D IAPHORUS 



.more than one-third of the length of the wing . 10. ARGYRA. 



I shorter than the head :f dusk y- ' 3. DOLICHOPUS. 

 I completely free : J Hypopygium of male j pale ^ a. SYBIBTEOKA. 



Proboscis 



longer than the head 4. ORTHOCHILE. 



