230 



ENTOMOLOGICAL NEWS. 



[May, '09 



men, as seen by transmitted light, clear honey yellow. Femora and 

 tibiae of fore legs usually shaded slightly with brownish yellow ; the mid- 

 dle and hind legs nearly transparent, except the distal ends of the femora, 

 these being rather strongly stained with light brown. The hind wings 

 are colored much like the fore wings, though with the general color not 

 as dark, and with the basal transparent cross-band much wider (in fact, 

 the basal two-fifths of the wing is almost entirely transparent). The 

 abdomen, when normally retracted, rather chunky and ovate in form. 



I have deposited two females in the collection of the U. S. 

 National Museum, one in the collection of the Minnesota Ex- 

 periment Station, and one besides the type in the collection of 

 the Massachusetts Agricultural College. 



Male. Length .95-1.03 mm. ; width of head .i5-.i6 mm. ; width of 

 mesothorax .2iy-.25S mm. Colored in general much like the female, 

 but with the sixth abdominal segment less strikingly darker than the rest 



of the body. The head very slightly narrower 

 in front than behind. The abdomen widest at 

 the base, being in that portion of about the 

 same width as the metathorax, and narrowing 

 rapidly toward the tube so as to be triangular in 

 outline as viewed from above or below ; the 

 hind angles of most of the abdominal segments 

 square and prominent and bearing one or two 

 stout spines each. The very large fore femora 

 give the male a striking appearance. The pro- 

 thorax of the male is about four-fifths as long as 

 the head, and the head is often so retracted into 

 the prothorax that they seem to be of about 

 equal length. 



Described from three males (the co- 

 types of this sex), one of which is deposi- 

 ted in each of the three following collections : United States 

 National Museum, Massachusetts Agricultural College and 

 Minnesota Agricultural Experiment Station. 



I wish here to acknowledge my indebtedness to Dr. E. A. 

 Back, from whom I received the specimens on which the above 

 descriptions are based. This species was first observed to be 

 associated with the citrus white fly (A. citris*) by Dr. Morrill 

 in 1906 in connection with the white fly investigation by the 

 Bureau of Entomology of Florida, and has been observed 

 many times in the act of feeding on the larvae, pupae and 

 eggs of this pest fly by both Mr. Morrill and Dr. Bach. They 



Fig. 2. Dorsal view of end 

 of abdomen of male, x 194. 



