ALBERT F. SWAIN 1& 



is found the chief structural difference between this species and Aphis bakeri 

 Cowen, for in the latter the beak "barely reaches to the second coxae." The 

 wTiter has just recently had opportunity to examine specimens of Aphis bakeri 

 Cowen, from clover and apple in Utah, taken by R. W. Doane diu-ingthe sum- 

 mer of 1916, and has noted the quite striking difference between the beaks of 

 this and Aphis senecio new species. The abdomen is dull pale green with 

 dorsal black markings in the form of blotches or spots. The cornicles (fig, 

 21) are short and dai"k, and tapering slightly, but mth the apex somewhat 

 flanged. The cauda (fig. 24) is short with the distal end dusky, about the 

 same length as the cornicles. The cornicles, cauda, and hind tarsi are sub- 

 equal in length. The coxae are black, the femora black or dusky with the 

 basal one-foui'th to one-third pale, the tibiae greenish with the apical one- 

 fifth to one-fourth black or dusky, the tarsi are black. The wings are of nor- 

 mal size and venation, being hyaline. The veins are light l^rown, the stigma 

 grayish brown. 



Measurements: Body length, 1.17-1.25 mm.: width of thorax, .47-. 48 mm.: 

 antennae total, 1.09-1.34 mm.; Ill, .31-.39mm.: IV, .19-23 mm.: V, .13-.1& 

 mm.; VI base, .08-. 11 mm.; VI, spiu-, .23-.36 mm.: cornicles, .09-. 11 mm.: 

 cauda, .08-.09 mm. : hind tarsus, .09-. 11 mm. ; wing length, 2.2-2.7 mm. ; wing 

 width; .87 mm. The spm' of segment VI is slightly shorter than III in most 

 cases, although in some it is equal to III, but never longer. 



Apterous vinpurous female. — Prevailing color pale green with head, pro- 

 thorax, antennae, legs, and cornicles almost luteous. The tip of segment's V 

 and all of VI are dusky. The cauda is pale green. The cornicles and cauda 

 are of the same shape as those of the alates. The beak is similar to that of 

 the alates, being pale with the apex dusky, and reaching distinctly beyond the 

 second coxae and even to the middle of the third coxae. The usual primary 

 and accessory sensoria are present on V and VI, but no secondarj' sensoria 

 are found. 



Measurements: Body length, 2.21 mm. : width of thorax, 1.07 mm. : antennae 

 total, 1 mm.; Ill, .24 mm.; IV, .17 mm.; V, .11 mm.; VI, base, .11 mm.; VI 

 spur, .22 mm. : cornicles, .11 mm.: cauda, .08 mm.: hind tarsus, .09 mm. 



Cerosipha" cupressi new species (Figs. 7, 8, 9, 13, 39.) 



In -Vpiil 191(), the writer observed a few specimens of a very 

 small green a])hid on the terminal twigs of blue cypress {Cupres- 

 sus guadelupensis) in Exposition Park, San Diego. Only the 

 small apterous females could be found. These were very re- 

 markal)le because of their very convex abdomen, conspicuous 



'iThis species does not fit exactly into either Sipha or Cerosipha, on account 

 of the atroi)hied cornicles. The description of Cerosipha is very brief and may 

 be extended to inclvide a species with such atrophied cornicles. Following is 

 a copy of Del Guercio's original description of the genus, wliich was published 

 in 1909 (?) in NOUVE RELAZIQNI R. STAZIONE ENTOM. AGRARU, 



TRANS. AM. ENT. SOC, XLIV. 



