DOLICIIOPID.i:. 



U9 



outlet (vi. pi, xi. iig. 11—10). The first week in June they 

 changed into pupae, casting their skin. The head of the pu])a 

 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 pupse 

 DoUchopus cBneus proceeded in a little more than tlu'ee weeks' 

 time. Trom tliis account, the transformations appear to be most 

 like those of the Empidce, 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 Rhamphomyia sp'mipes, figured by 

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



SYNOPTIC TABLE OF THE GENERA, 

 incurved, iingwiculated ,....,.... 15. Aphrosylus. 



f forked 1. Psilopus. 



neai-ly unarmed 



« "? ' [ very short and rounded 



° i» ° 8 tapering to a point : f ^^""^''"^^ '^"^^'S'^'^ 

 o -2 .a a the base | , 



abruptly enlarged 



' neai- the hind margin of the wing 



a 



« .2 



3 C 



-= 5-; 





to 3 



s o 



depressed : 

 Face 



very narrow 



14. Medeteeus. 

 13. Chrysotus. 



8. Rhaphium. 



9. Mach^rium. 

 5. Hydropfiorus. 

 G. Campsicnemus. 



broad 





■ 1 fdistant on the front 



conical or com- 

 pressed : Eyes-j 



.meeting on the front 



of the male 



Li 



^more than one-third of the length of the wing 



completely free : 

 Proboscis 



shorter than the head ; I ^ 

 Ilypopygium of male|pgj^ 



lunger than the head . . . 



7. Thinopiiilus. 



11. porphyrops. 



12. DiAPIIORUS. 



10. Argyra. 



3. dolichopus. 

 2. Sybistroma. 



4. Ortoochile. 



