298 



F. W. EDWARDS. 



Male Hypopygia. 



1. Basal lobe of side-piece bearing a row of flattened bristles or scales ; 



terminal spine of clasper wavy . . . . . . • • rusticus ^ (Rossi). 



Basal lobe of side-piece quite otherwise ; terminal spine of clasper straight 2 



2. Side-piece with three spines or differentiated bristles ; two on the basal 



lobe, backwardly directed, one more distally placed and inwardly directed 3 

 Side-piece with at most two differentiated bristles on the basal lobe . . 5 



3. Side-piece swollen in the middle, where it has a large inwardly-directed 



hair-tuft . . . . • • • • • • • • diantaeus, H. D. & 



Side-piece more regularly shaped, without hair-tuft in the middle . . ^ 



4. A distinct hair-tuft adjoining the apical lobe ; stem of claspette with a 



distinct projection near the middle intrudens, Dyar 



No definite hair-tuft adjoining the apical lobe ; stem of claspette somewhat 

 angulated but without definite projection pullatus (Coq.) 



K. 



Fig. 7. Claspettes of Palaearctic species of Aedes, dissected from hypopygia and drawn 

 in side view, all x 75 : a. A. maculains (Mg.) ; h, A. semicantans. Mart. ; c, A. luiescens (F.) 

 d, A. freyi, sp. n. ; e. A. annulipes (Mg.) ; i, A. excrucians (Walk.) ; g, A. punctor (Kirby) 

 h, A. detritus (Hal.) ; i, A. pullatus (Coq.) ; ], A. communis (De G.) ; \i, A. salinellus, Edw. 



1, A. cataphylla, Dyar. 



10. 



Basal and apical lobes of side-piece both very small, the latter hardly 

 distinguishable . . . . . . • . • • • • • • • • 6 



Either basal or apical lobes, or both, quite large and conspicuous . . 8 

 Appendage of claspette short and twisted, rounded at tip lepidonotus, Edw. 



Appendage of claspette long, curved and pointed 7 



Basal lobe without a spine . . . . mariae (Serg.) ; zanimiltii (Theo.). 



Basal lobe with a distinct spine pulchritarsis (Rond.). 



Basal lobe with two spines ; apical lobe ill-defined . . . . . . . • 9 



Basal lobe with at most one spine ; apical lobe nearly always well-marked . . 10 



Basal lobe very prominent (fig. 8 b) dorsalis {Ug). 



Basal lobe much less prominent (fig. 8 a) caspius (Pall.). 



Apical lobe reaching back to near middle of side-piece, and clothed with 



very short, curved bristles ; stem of claspette- short and straight . . 11 

 Apical lobe not reaching so far back, and bearing longer bristles . . 12 



