84 CLASSIFICATION OP THE ALEYRODID-ffi. 



Within the margin of dorsum of case all around is a series of 

 spines, 12 or 13 on each side. Margin faintly crenulate (PI. XXXI, 

 fig. 5) though the marginal wax tubes are very obscure. On the 

 dorsum are seven pairs of compound wax pores — one pair at cephalic 

 end of case and six pairs on abdominal region. The two cephalic 

 pairs of the abdominal series are about one-half the size of the others 

 and nearer the median line; in these pores the cup is short, reaching 

 scarcely above derm of case. The spinnerets occur in a circle at base 

 of cup, and are not vertically extended into tubes as in many species 

 of Aleurodicus. The central process is well developed and is broken 

 up into some 8 or 10 separate rods (fig. 4). Mesad of each of the first 

 and second pairs of abdominal wax pores is a group on each side of 

 simple wax pores. Cephalad of each of the pores of the first pair of 

 abdominal wax pores is an indistinctly stellate structure. These 

 simple pores and stellate structure are discernible only in the colorless 

 empty case. 



Vasiform orifice (PI. XXXT, fig. 3) broadly cordate, about as 

 broad as long. Operculum about one-half leng-th of orifice, broadly 

 convex on caudal margin, the sides rounded. Lingula large, spatu- 

 late, partly exserted, bearing distally two pairs of spines, and 

 minutely setose. On ventral surface rudimentary feet and antennae 

 very evident. 



Adult female. — Body about 0.85 mm. long. Color yellow; legs 

 and antennae paler; wings white, unmarked (PI. XXXI, figs. 6, 7). 

 Forewing about 0.8 mm. long by 0.33 mm. wide ; rudimentary media 

 arising from Rs about basal one-sixth of length of wing. Length 

 of hind tibia 0.3 mm. ; tarsal joints of hind legs subequal in length, 

 together measuring about 0.17 mm. Antennae (PL XXXI, fig. 9) 

 four-jointed, about 0.46 nim. long, joint III considerably exceeding 

 joint IV in length. Claws (PL XXXI, fig. 10) long, slender, with 

 spinous paronychium. 



Male. — Not seen. 



Type. — No. 14770, U. S. National Museum. Described from sev- 

 eral parasitized pupae on leaves, numerous normal and parasitized 

 pupae in balsam mounts, and several adult females in balsam mounts. 



III. Subfamily Aleyrodin^. 



In the members of this subfamily the media of the forewing is 

 lost, but the cubitus is retained as a distinct vein in most genera. 

 The radial sector forms the main vein of the wing, and radius ^ may 

 or may not be present. No compound pores are present in the pupa 

 case, and the paronychium is broad and hairy. 



Genera of the Aleyrodin.^. 



A. Forewing with radius,, radial sector, and cubitus present Aleurochiton. 



B. Forewing with only radial sector and cubitus present Aleyrodes. 



C. Forewing with ouly radial sector present NeomaskclUa. 



