63 INSECUTOR INSCITI^ MENSTRUUS 



figure 4 represent undosus, the same species in different views. 

 For this reason I could not separate identicus and jmdosus 

 by the male genitalia when treating of these forms recently 

 (Ins. Ins. Mens., vii, 119, 1919). The real structures are 

 abundantly distinct as shown by the figures (Plate II, figs. 

 1, 2), where I have drawn the structures from two aspects. 

 The stem of the clasper is long and slender, instead of short 

 and thick; the long basal arm of undosus is represented by a 

 shorter cone-shaped structure; the short side arm is wanting; 

 the terminal fimbriated plate is carried up to the outer margin 

 continuous with the terminal spines, the barred area being 

 reduced to a scalloped edge. 



Dr. and Mrs. Bonne examined a larval preparation of 

 aurescens in the British Museum, which they found the same as 

 identicus, thus fixing the synonymy beyond doubt. 



Sabethes cyaneus Fabricius (Plate II, fig. 4). 



Culex cyaneus Fabricius, Syst. Antliat., 35, 1805. 



Sabethes locuples Robineau-Desvoidy, Mem. Soc. Hist. Nat. Paris, 



iii, 412, 1827. 

 Culex remipes Wiedemann, Ansser. Zweifl. Ins. i, 6, 1828. 



I have made a new sketch of the clasper (fig. 4), as I do not 

 see the details in the same way as the artist did, and also for 

 more ready comparison with the next species. The basal curved 

 plate is enlarged and curiously subdivided ; the head portion 

 seems to me to represent a single mass, and not two lobes as 

 shown in our figure. The complication of the structure is 

 marked, but not in the direction of division into separate lobes. 



Sabethes bipartipes Dyar & Knab (Plate II, figs. 5, 6). 



Sabethes bipartipes Dyar & Knab, Proc. Biol. Soc. Wash., xix, 



136, 1906. 

 Sabethes chroiopits Dyar & Knab, Ins. Ins. Mens., i, 76, 1913. 



In this form the clasper is unexpectedly reduced. I show 

 the structures from two points of view (figs. 5 and 6). There 

 seem to be four plates, but they are similar and appressed. 

 The marginal one (fig. 5) bears a long terminal transverse 

 spine, and there is a dense area of fine spines on the opposite 

 side at base. Other details appear in the figures. 



