328 ENTOMOLOGICAL NEWS. [Nov., 'o6 



cornicle, 0.43 mm. ; cauda, 0.21 mm. Somewhat smaller than viviparous 

 form. At first yellow, then turning green and darker green. Head light 

 brown. Distal two-thirds of femora, tip of tibia, tarsi and cornicles 

 black, antennae black. Conspicuous horizontal black marking in pit of 

 connexivum on either side, these being more or less connected by black 

 lines on the sutures of the first six abdominal segments and coalescing 

 to form a faint but distinct black spot on abdominal segments 4-6. 

 Meta-tibia with numerous pores. 



Winged male. — Antennae, 2.8 mm. ; segments, 3, 0.68 mm. ; 4. 0.50 

 mm.; 5, 0.46 mm.; 6, 0.14 mm.; 7, 0.78 mm.; cornicle, 0,14 mm.; cauda, 

 0.14 mm.; wing 3.35 mm. long. The third antennal segment with 35 to 

 50 sensoria, the fourth segment with a row of 10 to 12 on basal two- 

 thirds, about 10 large sensoria on distal two-thirds of fifth segment, and 

 usual large sensoria at tip of sixth and seventh segments. Similar to 

 winged viviparous female, but reddish to reddish-brown, with black 

 markings on either side of dorso-meson of abdominal segments, 

 especially on the seventh segment where the marking converges on 

 the meson. 



The sexual forms were not found in the field nor were we 

 able to secure them from viviparous females in May. Whether 

 this is the normal time for the appearance of the sexes in 

 Texas, and where they occur in nature, or whether their ap- 

 pearance was due to the rearing in confinement for several 

 generations, are open questions. We know of no previous 

 record of the sexes, though Prof. F. M. Webster informs 

 us that he secured them many years ago. 



Mr. Th. Pergande has given very complete descriptions of 

 the viviparous forms (Bulletin 44, Division of Entomology, 

 U. S. Dept. Agr., pg. 14). Mr. C. E. Sanborn has kindly 

 drawn up a description of the form common in Texas. Seem- 

 ingly the only difference between this species and Macrosiphum 

 cerealis Kalt. is in the latter species lacking the black markings 

 of the abdomen of the former. The sizes as given by Pergande 

 are so variable that it would be impossible to distinguish the 

 species by size. Unfortunately, when specimens are mounted in 

 balsam, it is sometimes extremely difficult to distinguish the 

 black maculations on the abdomen. Specimens should there- 

 fore always be described as to color before mounting or pre- 

 serving. Some further distinction for mounted specimens is 

 therefore a desideratum, as unfortunately the two species have 

 been inextricably confused in the economic literature of this 

 country and will probably continue to be unless clearly dis- 

 tinguished. 



