92 THE CANADIAN ENTOMOLOGIST. 



distad ; the spot on cephalic side of vein is irregularly rectangular, its 

 inner end touching vein at its caudal flexure. At about distal fourth of 

 wing are three irregular sports in a transverse stripe. The vein termi- 

 nates in the median spot. When seen under a hand lens, these markings 

 appear as two irregular zigzag lines extending transversely across the 

 wing. When the wings are folded the stripes of one side appear con- 

 tinuous with those of the other side. 



Antennae seven-jointed. First joint short, subconical, about one-half 

 as long as second ; second, about one-half as wide as long, truncate dis- 

 tally ; third, long, slender, five-sixths length of distal four together ; 

 fourth, about three-fourths length of fifth, cylindrical ; sixth and seventh, 

 subequal in length ; sixth, cylindrical ; seventh, swollen, tapering distally, 

 bearing a terminal seta. Joints third and distally, rather closely ringed. 

 Eyes completely divided transversely, the larger division ventrad. Mentum 

 long, three jointed ; first joint short, about one-third length of second ; 

 second long, being rather longer than third ; third usual, tipped with 

 black. Rostrum short, conical, bearing three long setae. In third pair 

 of legs, femur slender, about two-thirds length of tibia : tarsus and claw 

 together as long as femur. Distal joint and claw of tarsus about as long 

 as proximal joint. Vasiform orifice, as seen in dorsal aspect, sub- 

 circular; operculum, slightly convex, with its caudal margin concave ; 

 minutely setate on margin; lingula projecting some distance caudad, 

 club-shaped; minutely setate. Main vein of fore wing nearer cephalic 

 than caudal margin, making a bend caudad near the middle of its length. 

 Basal veinlet arises distinct from main vein (possibly connected by cross 

 vein at very base) extending obliquely backwards, reaching margin at 

 about one-third length of wing. Wings all around on the margin deli- 

 cately beaded. On cephalic margin of hind wings at base are seven to 

 nine setfe. 



,$ . — Length to tip of genitalia about i mm.; proportionately smaller 

 than female. Genitalia forcipate, an acute prominent tooth on each valve 

 at base. Penis enlarged at base, tapering and curved upwards, about 

 five-sixths length of valves. In other respects essentially as in female. 



This aleurodid was sent in by a correspondent from South Florida, 

 to Prof. P. H. Rolfs, on leaves of cultivated geranium, to which it was 

 regarded as a severe pest. 



EXPLANATION OF FIGURES. 



Aleurodes graminicola. 



Figure 19. — Illustrating pores on third, fourth and fifth abdominal 

 segments of pupa-case. 



