A SYNOPSIS OF THE APHIDIDAE 63 



In July, 1915, Roy E. Campbell of the Bureau of Entomology, 

 sent the author specimens of a Macrosiphum sp. from squash in Hay- 

 ward. In 1917 the author found the same species abundantly on 

 squash in Los Angeles. These the author identified as being specimens 

 of M. cucurbitae (Thomas). Later J. J. Davis verified the deter- 

 mination. This is a new record for California. As the available 

 descriptions of this species are quite inadequate, the author gives 

 herewith a few descriptive notes taken from these specimens.. 



Alate viviparous female. Antennae longer than the body, placed 

 on distinct frontal tubercles, dusky except I, II, and extreme base 

 of III. The spur of VI is the longest segment, followed by III, which 

 is about four-fifths as long. IV and V are subequal, and almost as 

 long as III. The usual primary and accessory sensoria are present 

 on V and VI. Secondary sensoria are present on III (fig. 133), being 

 small, circular, numbering about 14 to 15, and arranged in a fairly 

 even row along the whole length of the segment. Beak pale with 

 dusky tip, reaching to the second coxae. Thorax and abdomen green, 

 the thoracic lobes not conspicuously darkened. Cornicles (fig. 134) 

 green with apical one-third dusky, equal to or slightly longer than 

 III, imbricated with tip reticulated. Cauda large, pale, vasiform, 

 slightly more than half the length of the cornicles, reaching to their 

 apices. Wings and legs normal. 



Measurements : Body length, 2.3 mm. ; antennae total, 3.25 to 3.35 

 mm. ; III, 0.685 to 0.714 mm. ; IV, 0.629 to 0.646 mm. ; V, 0.603 to 

 0.612 mm. ; VI, base, 0.136 to 0.153 mm. ; VI, spur, 0.935 to 0.696 mm. ; 

 cornicles, 0.714 to 0.731 mm. ; cauda, 0.408 mm. 



67. Macrosiphum dirhodum (Walker) 



Figures 156, 157 



Walker, Ann. Nat. Hist., (2), vol. 3, p. 43, 1848. Aphis (orig. desc.). 

 Theobald, Jour. Econ. Biol., vol. 8, p. 128, 1913 (desc.). 

 Patch, Maine Agr. Exp. Sta., Bull. 233, p. 268, 1914 (note). 

 Gillette, Jour. Econ. Ent., vol. 8, p. 103, 1915 (note). 



Record. Eose, Santa Ysabel (3000 feet altitude), San Diego County, May, 

 1916; Eiverside, April, 1917. 



The author found this species sparingly on rose near Santa Ysabel, 

 San Diego County, in May, 1916, and again in April, 1917, in River- 

 side. According to Gillette, this species passes the winter on rose, 

 and the summer on various grains and grasses, as M. rosa-e (Linn.) 



