APHIDID.E OF SOUTHERN CALFIORNIA X* 



E. O. ESSIG 

 SECRETARY OF STATE COMMISSION OF HORTICULTURE 

 SACRAMENTO, CALIFORNIA 



Tribe CALLIPTERINI 



Certainly I cannot do better in presenting the chief cliaraeteristics, with 

 the genera, and synonymy of the tribe CaUiptcrim than to give verbatim or 

 the substance of the work of ilr. W. H. Wilson, who has published "A Key 

 to the Genera and Notes on the Synonymy of the Tribe Cellipterini, Family 

 Aphididse, " in the Canadian Entomologist, Vol. XLII, No. 8, pages 253-259, 

 August, 1910. The chief cliaraeteristics of the tribe, the key to the genera, 

 and characters and synonymy of the genera as well as those of the type species 

 are all taken from his work. The keys to the California species I have worked 

 up as fully as descriptions and material will allow. Though this article will 

 add little to the general working public, yet it should be of some value to aphid 

 workers in this state, and it is with this aim in view that it is undertaken. 



Chief Characters 



Body — Small, slender, delicately and beautifully colored. Young are 

 usually covered with fine or glandular hairs, each arising from a small body 

 tubercle, and which are sometimes retained in the adult apterous forms. 



Antennae — Variable in length, slender, seldom shorter than the body, 

 six-articled with the spur <)f article VI variable in comparison with the length 

 of the base. 



Rostrum — Short and stout. 



Legs — Normally long, slender, with sliort fine hair, delicately shaded. 



Wings — Rather long and slender, t)cautifully shnded or hyaline, venation 

 as in Aphidini, constant. 



Cornicles — Variable in length, oi' almost entirely wanting, usually short 

 and tubercular. 



Style — Globular with constricted base, hairy. 



Anal plate — Large, distinctly bi-lobed. 



Key to Genera 



1. Antennal tubercles prominent antenna^ always exceedingly long. 3 



2. Antennal tubercles wanting or very small ; antenna? variable in 



length, sometimes shorter than the body. 4 



3. Nectaries very long and large. 5 

 Nectaries very short and more or less constricted at the middle. 6 

 Nectaries little more than pores. 10 



4. Nectaries distinct, usually being longer than broad at middle. 7 

 Nectaries little more than pores and l)roader than long. 10 



*The last of this series of articles was iiiiinbered VIII by mistake. It should 

 have been IX. 



