462 NEW YORK STATE MUSEUM 



more or less broadly triangular and generally closely appressed 

 to the vein. The striking variations in scale characters are very 

 well shown by reference to plate i, figures 2, 3, which illustrates 

 some of the more unique exotic forms supplementing the illustra- 

 tions of these organs published in Museum Bulletin 79. The wing 

 of our native Theobaldia incidens Thom., [pi. 3, 

 fig. i], illustrates a marked tendency toward segregation of 

 scales, which is shown even better in the enlargement reproduced 

 at plate 3, figure 3. The Australian Mucidus alternans 

 Westw. [pi. I, fig. 2], is another instance of segregation and the 

 peculiar dilated scales are well sho\vTi at plate i, figure 4. The 

 South American Mansonia titillans Walk., has a very 

 striking wing [pi. i, fig. i], which is clothed with numerous closely 

 set, dilated, asymmetric scales, some of which are shown much 

 enlarged at plate i, figure 3. The tendency toward dilated wing 

 scales appears in widely separated individuals, as for example 

 Aedeomyia squammipenna Arrib., the wing of which 

 [pi. 2, fig. i], presents a peculiar mottled appearance, easily 

 explained when we examine an enlargement thereof [pi. 2, fig. 3]. 

 The rather highly specialized African Eretmapodites 

 quinquevittatus Theo., has a narrow, long wing [pi. 2, 

 fig. 2], with a very peculiar arrangement of the scales shown en- 

 larged at plate 2, figure 4. The extreme in wing elongation is 

 exhibited by the South American Sabethes remipes 

 Wied. [pi. 3, fig. 2], and the general character of its wing scales 

 are well brought out at plate 3, figure 4. 



These striking variations in wing structure appear to be rather 

 closely correlated with variations in other organs and are of con- 

 siderable value in systematic work. The marked divergencies in 

 wing clothing or scales appears to be more erratic and of com- 

 paratively little aid in indicating lines of descent though frequently 

 of great value in the recognition .of species. 



Genitalia. The male genital organs in the Culicidae present 

 remarkable diversities and afford most excellent characters for 

 the grouping of allied species. The large conspicuous lateral 

 organs have been termed the clasps. They are composed of two 

 segments, a large basal one which presents considerable modi- 

 fication in form and bears, particularly in Culex as at present 

 restricted, very characteristic appendages near the apical third, 

 and near the base more or less peculiar chitinous spines usually 

 on an elevation or tubercle. The term claspette is employed 

 to designate certain peculiar and very significant organs occurring 



