Eyer.vrd E. Blanchard : Aphid notes 



2o5 



Macrosiphoniella tanacetaria (Kalt.) var. bonariensis n, var. (fig. 10) 



Apiernas virgogene. 



Color : Bright emerald green to yellowish green, covered with 

 a white mealy secretion that forms an irregular longitudinal stripe 

 on either side of the median, Eyes bright red. Antennae black ; base 

 of segment III, brownish. Legs black. Rostrum with segment I 

 greenish, rest all black. Head, cauda, cornicles and anal píate bla- 

 ckish. Genital píate slightly dusky to brownish. 



Fig. 10. — Macrosiphoniella tanacetaria (Kalt.) var. bonariensis, Blanchard. 

 Apterous virgogene : a, anterma ; 6, segment III of anterma ; c, cornicle ; 

 d, tip of cornicle; e, cauda. Álate virgogene : f, cauda; g, antenna ; h, 

 segment III of antenna ; i, cornicle ; j, tip of cornicle. 



Morphological characters : Oval, slightly convex. Dorsum provi- 

 ded with transverse series of rather stout hairs that arise from small 

 colorless tubercles. Venter with irregular double series of smaller 

 piliferous tubercles on each somite. Antennal imbrication visible 

 on all segments except I and II. III provided with rather stout 

 hairs that are subequal in length to its greatest breadth and with 

 from 7 to 12 small subcircular sensoria, scattered over its basal 

 half. Rostrum reaches 3rd. coxae with its apex. Cornicles rather 

 stout, expanding gradual] y on apical i/4 and provided with dis- 

 tinct rather cióse polygonal recticulations on distal 1/2. Rasal half 

 Avith fine spinulose imbrications ; apex very slightly dilated. Cauda 

 slightly constricted towards base apex sub-acuminate, with about 

 7 or more lateral and about 10 dorsal bristles. 



