12.S 



PS 2 CHE. 



{ November — December iSSS 



My observations upon the species 

 began about the middle of October 

 18S7, when I found the vvinged vivipa- 

 rous females {psetidogyna pupifera) 

 establishing colonies of sexed individ- 

 uals upon the leaves and stems of vari- 

 ous compositae., especiall\-, Solidago 

 and Lactuca. Although the red speci- 

 mens were l)y far the commoner, 

 the green variety mentioned by Dr. 

 Thomas was frequently seen. The 

 first specimens seen in copula were 

 taken on 18 October, and the first 

 eggs were found on the stem of Lac- 

 tuca canadense on 28 October, in com- 

 pany vs'ith oviparous females. On 9 

 November, a carefid examination was 

 made of many old plants wliich had 

 previously been infested by the lice 

 (as shown bv the cast skins), but no 

 living specimens nor eggs were found. 

 The roots and the earth about the roots 

 was also examined with like result. 

 Two days later however the oviparous 

 females were found abundantly on the 

 under leaf-surface of many young plants 

 of Lactuca and Mnhlciihergia^ where 

 they were depositing eggs freely. Hence 

 I concluded that the occurrence of eggs 

 on the stems of old plants is exceptional, 

 and that the normal habit of the species 

 is to deposit the eggs on the young 

 plants of such biennials or perennials 

 as it infests. 



Winged viviparous female {pseu- 

 dogyna pupifera) . 



Expanse of wings .... 7.6 mm. 

 Width of body (across thorax) 0.9 mm. 

 Length of body 3.0 mm. 



" " antennae .... 3.2 mm. 



" " cornicles . . . .1.0 mm. 



" " Cauda 0.3 mm. 



Head dark reddish-brown, shining. 

 Prothorax of same color. Meso- and 

 metathorax slightly darker, shining. 

 Abdomen nearly black with a slight 

 greenish tinge, shining. Ventral sur- 

 face greenish black. Antennae long, 

 tapering, black except basal joint, 

 which is unicolorous with head ; with 

 rows of rather sparse hairs. Joint I 

 short, large ; H small ; HI long, tuber- 

 culate ; IVand V subequal, each nearly 

 as long as HI ; VI very short, about -J as 

 long as V ; VI-VH very long, slender. 

 Legs long, hairy ; distad of middle of 

 femora brownish-black, proximad dull 

 greenish- or yellowish-brown. Corni- 

 cles very long, black, cylindrical, with 

 flange at tip. Cauda long, greenish. 

 Rostrum greenish with duskv tip, 

 reaching second coxae. Tegulae green. 

 Insertion of veins yellowish green. 

 Costa brown ; cubitus yellowish ; stig- 

 ma greenish ; other veins brown. 



The depth of coloring of the body 

 varies considerably. One specimen 

 examined was very dark, another quite 

 light. 



Described from two specimens taken 

 on Lactitca canadense 25 October 

 1887, establishing colonies of young. 



Winged male. 



Wing expanse .... 6.8 mm. 



WidUi of body .... o.S mm. 



Length of body .... 2.4 mm. 



" " antennae . . . 4.0 mm. 



" " cornicles . . 0.4 mm. 



" " Cauda .... 0.2 mm. 



Dull vellowish-brown, slightly dark- 

 er on dorsum of thorax and central 

 parts of ventrum. Antennae black, 

 slightly brownish at base. Legs very 

 long, black, except coxae, trochanters 



