14 MAINE AGRICULTURAL EXPERIMENT STATION. I9II. 



setae and setulae being practically the same as those of the upper 

 plate. The ovipositor slightly exceeds the supra-genital plate 

 in length. The sting-palpi are narrow, compared with those of 

 Psylla Hoccosa. Fig. 12 represents this segment. 



Male. The genital segment (fig. 10) is of the same general' 

 type as that of floccosa and it would be difficult to separate these 

 two species on that segment without a dissected mount. A re- 

 liable character is found, however, in the forceps of the sub- 

 genital plate. When viewed from the caudal aspect each arm 

 of the forceps is seen to be tipped with two acute claw-like pro- 

 jections in contrast with the blunt forceps of floccosa. The 

 terminal inner setae of the forceps are not so numerous as in 

 Hoccosa. Fig. 11. 



The color notes are taken from the living specimen, and the 

 structural details from balsam mounts. Cotypes collected from 

 Almis incana (L) Moench. July-September, at Orono, Maine. 

 (Lot 1326 Sub. 3.) 



Psylla striata n. sp. 



The tips of birch shoots were very commonly covered by in- 

 conspicuous woolly masses in the new growth during the spring 

 of 1910. Concealed in this protective covering were psyllid 

 nymphs. Late in June the mature forms appeared. The fresh- 

 ly molted specimens had greenish thorax and abdomen and yel- 

 low wings. Among the older well colored individuals the fe- 

 males had 3 distinct, abruptly marked color divisions, the head 

 and thorax being amber yellow, the abdomen vivid green to the 

 cephalic edgo^ of the genital segment which was dark yellowish 

 brown. The wings were amber in tone and darker than the 

 head and thorax. In the male the head and thorax were pale 

 amber yellow, the wings a darker yellow and the abdomen pale 

 green. The eyes of both male and female 'were dove gray. 



Head. The head is broader than the prothorax. The ce- 

 phalic aspect (Fig. 16) presents the following characters. The 

 2 epicranial plates taken together are heart-shaped, the dorsal 

 line being a concave curve and the line from the posterior ocelli 

 to the front ocellus being a convex curve. A distinct median 

 suture separates these plates. The frontal lobes are prominent 

 but are relatively shorter than in floccosa and galcaformis and 

 are more rounded. They are supplied with setae. The anten- 



