330 F. W. EDWARDS. 



19. Mesonotal scales ochreous-tinged . . . . . . . . fatigans, Wied. 



Mesonotal scales generally reddish-brown . . . . . . . . pipiens, L. 



20. Upper fork-cell in female with a very short stalk ; last two joints of 



male palpi with a white line beneath . . . . . . pipiens, h., var. 



Upper fork-cell in female with a longer stalk ; last two joints of male 

 palpi dark beneath . . . . . . . . . . . . laurenti, Newst. 



Male Hypopygia. 



• 1. Side-piece with scales, the lobe scarcely if at all beyond the middle, 



without flattened plate {Barraudius) . . . . . . . . . . 2 



Side-piece without scales, the lobe well beyond the middle . . . . . . 3 



2. Clasper long and slender . . . . . . . . . . modestus, Fie. 



Clasper shorter and stouter . . . . pusillus, Macq. 



3. Clasper with a conspicuous spiny crest (?) ; side-piece with a large and con- 



spicuous tuft of hairs projecting outwards {Culiciomyia). inipudiciis. Fie. 

 Clasper without conspicuous subapical spiny crest ; side-piece without 

 conspicuous hair-tuft {Culex) . . . . . . . . . . . . 4 



4. Lobe of side-piece without an apically situated flattened plate . . . . 5 

 This plate present, or represented by several . . . . . . . . . . 6 



5. Side-piece with an apical finger-like process ; appendages of lobe short 



hortensis, Fie. 

 Side-piece without linger-like process ; appendages of lobe long, apicalis, Adams. 



6. Lobe of side-piece with several flattened plates . . . . hayashi, Yam. 

 Lobe of side-piece with only one flattened plate . . . . . . . . 7 



7. Plate on lobe of side-piece narrow and pointed . . . . . . . . 8 



The plate broad, rounded, and leaf -like . . . . . . . . . . 10 



8. Tenth sternites without basal arm quasigelidus , Theo. 



Tenth sternites with well-developed basal arm . . . . . . . • 9 



9. Mesosome formed of two pairs of upwardly-directed, sickle-shaped 



structures ; basal ami of tenth sternites short . . hitaeniorhynchus, Giles. 

 Mesosome foraied of one pair of pointed, almost straight structures ; basal 

 arm of tenth sternites long sinensis. Theo. 



10. Side-piece with dense hairs round the tip and near the lobe .. .. 11 



Tip and region near lobe of side-piece not densely hairy . . . . . . 12 



11. Clasper greatly widened in the middle, ending in a long, sharp point 



orientalis, sp. n. 

 Clasper not much widened in the middle laticindus. Edw. 



12. Basal aim of tenth sternites well developed . . . . . . • • . . 13 



Basal arm of tenth sternites very short or absent . . . . . . . . 19 



13. Clasper sickle-shaped, gradually tapering to the tip . . . . . . . . 14 



Clasper somewhat broadened beyond the middle . . . . • . . . 18 



14. Mesosome elaborately divided, the two main divisions each further split up 15 

 Mesosome much more simple . . . . . . . . . . • • . . 17 



15. Lower division of mesosome with only two or three teeth, which are 



turned outwards mimeticus. Noe. 



Lower division of mesosome with 4-6 teeth, which are spread out finger- 

 like or curved tailwards . . . . . . . . • • • • . . 16 



16. Innermost tooth on mesosome considerably longer than the rest 



iritaeniorhynchus, Giles. 

 All the teeth approximately equal in size vishnui, Theo. 



