556 Pomona College Journal of Entomology 



Rcachinfj to nietathorax, lemon yellow, dusky at tip. Thorax — Gradually widens 

 from protiiorax backwards, segments compact and pushed up dorsallj' to form 

 transverse lobes. Abdomen — Globular, as wide as long, several transverse depres- 

 sions on dorsum, smooth. Legs — Short, stout, hairy. Style — Rounded, hairy, 

 not visible in more robust forms, but distinct in smaller individuals. 



Apterous females are very scarce and I was able to obtain but a very few. 

 Those found were in the curled leaves and producing great numbers of young. 

 They appear to be true stem-mothers. 



Host — On Mountain Ash {Fraxinus ilipetala H. & A.). Winged forms and 

 nymphs were found feeding on the undersides of the leaves, which they curled into 

 knots of various shapes, upon the stems of the younger growth, at the bases of 

 the suckers and hidden by the deca^'ed and fallen leaves, while some forms were 

 taken around the trunk of the trees at quite a depth underground. The nymphs, 

 especially, were often found in large colonies on the young stems. The few adult 

 apterous forms were found only within tlie masses of curled leaves, whicli usually 

 occur at the tips of the new growth. 



Locality — The infested ash trees are located on the north slope of the moun- 

 tains, six miles north of Santa Paula, at an elevation of from 1000 to 2000 feet. 

 Date of collection — May 7, 1911- Serial number 33. 



This species differs from Pemphigus fraxhiifolii Thos. in tlie following: 



Pemphigus fraxinifolii Thos. Pemphigus fraxini-dipetalae n. sp. 



Wings — Trans))arent with mealy Dusky, with bluish tinge, transpar- 



white tinge. ent. 



Third discoidal vein arising near base Third discoidal not arising near base 



of second, almost invisible, not obsolete of second, plainly visible and distinct, 



at tiie base. obsolete at base. 



Obliques in hind wing connected. Obliques in hind wing arising from a 



\\'ing expanse 5.7 mm. common dark spot, their bases may be 



Bod;/ — Length of body 2 mm. Abdo- at a common point or somewhat distant, 



men dark green, with large roundish ^Ving expense 12. mm. 



spots on each side. Length of body 3.5 mm. Body almost 



Antennae — Article III of winged or black, side spots very small, 



form as long as IV and V together. Article III of winged form not as 



Medium in size. long as IV and V together. 



Very large. 



APHID SYNONYM V 



In connection with the Host Index to California Aphididae and the synonymy 

 of the genera and species, it was stated that all .idditions and corrections would 

 be added as fast as possible. I am therefore taking this opportunity to in.ike the 

 first additions and corrections. 



In ;i letter from Mr. John Davis he called attention to the following: 

 I'ir.it — That Calaphis hctulaecolens Fitch is wrong in that the species 

 hetiilaecolens does not belong to this genus, it being a fact that onlv the species 

 betulella Walsii belongs to the genus Calaphis. 



