Pomona Coi.i.KciK Joihnm, of Kntomouhiy 785 



shako tlipiii off except l>y violent and sudden jnrrin^'. Mr. W. M. |)ii\-i(ison 

 has des(iil)ed an aplii<l (Larlnius pini-radiatar*) which is prohably synony- 

 moiis with this species, fcedinfr upon the Monterey Pine ( f'iinis raliala (Jord.l 

 and on the Silver or Dipper Pine (/'ihi/.s- .inhiiiiiina Doupl.) Am also in re- 

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

 prcatly resenihlcs this species, and which is without doui)t identical with it. 

 It was taken from the White F'ine (I'ii)iis strDhus) at Stillwater, Maine. 



Lorrt/iVi/— Collected by the writer at Pomona College, Claretnont, Cal., 

 and at Santa Paula. Cal. 



Dafe of coUerlinit — Durinsr the winter mouths of l!)08-lf)fl!) at Clarcmont 

 ind on July 27. 1911. at Santa Panln. Cnl. Serial number 47. 



Tribe PTEROCOMMINI 

 General Characters 



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

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



Antenvae — T'snally shorter than the body, but variable in lenpth. six- 

 articled, not on frontal tubercles, covered with lonp rather stout hairs, which 

 have larpe ba.sal tubercles. 



Legs — Stout, hind leps lonpest. very hairy. 



Wing vcnaiinn — As in Aphidini. with little or no variations. 



f'nrviclex — Lonper than tho.se in the tribe Chaitophorini. usually consid- 

 erably lonper than broad, cither cylindrical or vasifonn. never very lonp. 



Stti/Ip — Thick, short, well rounded with broad base. 



In the followinp arranpcmcnt T am apain followinp Prof. Wilson and find 

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

 represented. Melmwranthrrium and Pfrrnconnna. Tt is stranpe ton that the 

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

 latter penera under the name Claflohiun. when both should have been i)laeed 

 under the former. These penera Prof. Wilson se[)arates as follows: 



Key to Genera 

 Cornicles swollen or vasiform. niclanoranthcrium 



Cornicles cylindrical. pterocnninm 



MELANOXANTHERIUM Schoutcden 



Syn. Melanoxanthus Puickton 



Type Aphis salicis Linn, 



Key to California Species 



Body prayish brown or anib«>r. with distinct dorsiil niarkinps, .sliphtly 



purvclent. ntfulus (Da\-idson) 



'Lachnus pini-radiatae Davidson cannot he this species, because in his descrip- 

 tion, Davidson Kives the measurements of the antennal articles: III, 48 mm.; TV. 

 0.28 mm.: V, 0.28 mm.; VI. 0.23 mm. From these it will 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 lenprth of the sixth article. It must be a Kood and distinct 

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

 comparative study. 



