14 



BULLETIN 276, U. S. DEPARTMENT OF AGRICULTURE. 



bearing the cornicles, which are cf a decided bright yellow tint. 

 Antennae five-segmented, reaching a little beyond tip of body, seg- 

 ments I and II concolorous with head or paler, the 

 remaining segments whitish sornitransparent with 

 the tips of III, IV, and basal part of V dusky. 

 Eyes bright red. Legs concolorous with antennae, 

 excepting tarsus which is dusky. Cornicles con- 

 colorous with antennae the tip dusky, slightly nar- 

 rowed at tip, and reaching beyond tip of abdomen. 

 Stylo not visible. 



Measurements from two specimens, immediately 

 after placing in balsam and before shrinkage oc- 

 curs: Length of body, 0.91 mm., width, 0.40; length of cornicles, 0.139 

 mm. Measurements of antennal segments : 



Fig. 3. — MacTosiphu7ii 

 pisi: First instar of vi- 

 viparous generation. 

 Much enlarged. (Orig- 

 inal.) 



I. 



II. 



III. 



IV. 



V base. 



V filament. 



Mm. 



Mm . 



Mm. 



Mm. 



Mm. 



Mm. 



0.06 



0.05 



0.19 



0.18 



0.0S7 



0.39 



.07 



.05 



.208 



.20S 



.094 



.45 



.07 



.05 



.208 



.208 



.100 



.45 



.07 



.05 



.208 



.208 



.100 



.45 



Second instar, after first molt and 50 to 60 hours old. — (Described from 

 four specimens, Aug. 19-22, 1912.) Entire, body pale green; eyes 

 red; antennae reaching a little beyond tip of abdomen; segments I 

 and II pale green and somewhat transparent; III, IV, and base of V 

 pale, semitransparent, with the tips dusky; filament of VI blackish; 

 segment III sometimes with a dusky ring near middle, but not con- 

 stricted. Beak reaching coxae of second pair of legs. Legs with 

 femur very pale green, the tip dusky, tibia pale, becoming dusky 

 toward tip, the tip blackish, and tarsus black. Cornicles pale, semi- 

 transparent, becoming pale dusky near apex, the extreme tip black. 

 Cauda concolorous with body. 



Measurements from two specimens, immediately after placing in 

 balsam and before shrinkage occurs : Length of body, 1.16 mm., width, 

 0.53; length of cornicles, 0.25 mm. Measurements of antennal 

 segments : 



I. 



ir. 



III. 



IV. 





V filament. 



Mm. 



.\rm. 



Mm. 



Mm . 



Mm. 



Mm. 



0. 104 



0. 060 



0.348 



0.261 



0.129 



0.76S 



.095 



.069 



.330 



.270 



. 139 



.608 



.101 



.060 



.348 



.270 



. 139 



.600 



.095 



.060 



. 148 



.27s 



.139 



.608 



Third instar, after second molt and 75 to 97 hours old. — (Described 

 from three specimens, Aug. 20-23, 1912.) Body pale green, tin' ante- 

 rior portion, including head, slightly paler or yellowish green; some 



