Pomona College Journal of Entomology 785 



shako them off cxco])! hy vioh'iit and sudden jai'i'inj;. Mr. W. M. Davidson 

 has described an aphid (Lnchinis pini-radiatae*) which is prol)ably synony- 

 mous with this species, fcedin;,' upon the INTonterey Pine (PniH.v rnliafa Gord.) 

 and on the Silver or Digger Pine (Piiius nahininna Dougl.) Am also in re- 

 ceipt of a single winged species from Edith M. Patch, Orona, Maine, which 

 greatly resembles this species, and which is without doubt identical with it. 

 It was taken from the White I'ine {Finns atrohus) at Stillwater, Maine. 



Locality — Collected by the writer at Pomona College, Claremont, Cal., 

 and at Santa Paula, Cal. 



Date of collection — During the winter months of 1908-1909 at Claremont 

 ■and on July 27, 1911, at Santa Paula, Cal. Serial number 47. 



Tribe PTEROCOMMINI 

 General Characters 



Body — Usually large and somewhat flattened ; very hairy, the hairs short 

 and fine, may or may not have lateral body tubercles. 



Ante7ivae — TTsually shorter than the body, but variable in length, six- 

 articled, not on frontal tubercles, covered \y\th long rather stout hairs, which 

 have large basal tubercles. 



Legs — Stout, hind legs longest, very hairy. 



Wing venation — As in Aphidini, with little or no variations. 



Corvicles — Longer than those in the tribe Chaitophorini, usually consid- 

 erably longer than broad, either cylindrical or vasiform, never very long. 



Style — Thick, short, well rounded with broad base. 



In the following arrangement I am again following Prof. Wilson and find 

 that there has been considerable confusion in this tribe. Two genera are 

 represented, Melanoxantherivm and Pterocomma. It is strange too that the 

 only California species listed or described in this tribe were placed in the 

 latter genera under the name Cladobius. when both should have been placed 

 under the former. These genera Prof. Wilson separates as follows : 



Key to Genera 

 Cornicles swollen or vasiform. melanoxantherium 



Cornicles cylindrical. pterocomma 



MELANOXANTHERIUM Schnuteden 

 Syn. Melanoxanthus Buckton 

 Type Aphis salicis Linn. 

 Key to California Species 

 Body grayish brown or amber, with distinct dorsal markings, slightly 



purvelent. rufulus (Davidson) 



*Lachnus pini-radiatae Davidson cannot be this species, because in his descrip- 

 tion, Davidson gives the measurements of the antennal articles: III, 0.48 mm.: IV, 

 0.28 mm.; V, 0.28 mm.; VI, 0.23 mm. From these it -n-ill be seen that the insect has 

 six antennal articles and it is not possible that the spur was counted as a separate 

 article, because of the length of the sixth article. It must be a good and distinct 

 species, though I have been unable to get specimens of it from Mr. Davidson for 

 comparative study. 



