CURRANT AND GOOSEBERRY APHIDS IN MAINE. 5/ 



slight and for the most part relative seem to be too constant 

 to admit of interpreting them as varieties of a single species. 



I have never taken any lemon yellow specimens of this species. 

 The apterous viviparous females are greenish water white with 

 longitudinal median and lateral Hues (three in all) of vivid 

 green. The winged female is very pale green with the three 

 vivid longitudinal lines as mentioned for the apterous form and 

 a few blackish transverse markings on caudal half of abdomen. 

 The cornicles are water white, the cauda pale. The pupa is 

 pale greenish white with the three green longitudinal lines, and 

 when nearly ready for the final molt has thoracic lobes pellucid 

 brownish like the thorax of the winged females. The hairs of 

 this species are capitate like those of ribis. 



Attention has already been called to the antennal dfferences 

 of these two species. The wings of dispar Hke those of ribis 

 are not uniform as to the vein angles and distances and any 

 distinctions based on this character would be misleading. The 

 cornicles of dispar are relatively shorter and less slender than 

 those of ribis. (29-13). 



Macrosiphum lactucce. • : : 



Figs. 23, 24, 25, 26, 27, 36, 38. 



A common species on cultivated currant and gooseberry in 

 i\Iakie accords with specimens of M. lactuccs and I am recording 

 it as that species provisionally for the present, athough I have 

 not as yet made successful transfers to lettuce or Sonchus. 



The character of the work of this aphid on gooseberry is 

 shown in Fig. 30. 



It is an alert, glistening, bristly species. The apterous vivi- 

 parous females are green and without markings, with cauda 

 and cornicles concolorous. The antenna with III slightly swol- 

 len along proximal half and with from one to several sensoria 

 on swollen part. Fig. 25. 



The winged viviparous females have the abdomen heavily 

 marked with irregular black transverse bars, black cornicles and 

 dark cauda. The cornicle has a few rather wrinkled reticula- 

 tions at distal tip and a very faint imbrication over the rest of 

 the surface. (Fig 24). The antennae have sensoria on iii and 

 IV, as shown in Fig. 23. The wing is given in Fig. 38. (20-12) 

 (27-13)- 



