A SYNOPSIS OF THE APHIDIDAE 65 



71. Macrosiphum lactucae (Kalt.) 



Kaltenbach, Monog. d. Pflanzenlause, p. 199, 1857. Nectarophora (orig. 



desc.). 



Sanderson, Can. Ent., vol. 33, p. 69, 1901. Nectarophora (desc.). 

 Essig, Univ. Calif. Publ., Entom., vol. 1, p. 328, 1917 (list). 



Record. Cicorium intybus, Kutherford^ Napa County, 1916 (Essig). 



This species has been taken only by Essig on chicory in Napa 

 County during June, 1916. As its determination is doubtful the 

 author gives herewith a brief description of the alate female. 



Body pale to green, with the following parts more or less dusky : 

 head, antennae, prothorax, thoracic lobes, apex of beak, tarsi, apical 

 one-fifth to one-fourth tibiae, apical one-half femora, cornicles, anal 

 plate, marginal spots on the abdominal segments, submarginal spots 

 of the second and third abdominal segments, dorsal bands on the 

 fourth and fifth, and the dorsum of the remaining abdominal seg- 

 ments. Eyes red. 



The antennal tubercles are prominent and project rectangularly 

 inward. A prominent frontal tubercle is present on the apex. The 

 antennae are about half as long again as the body. The usual primary 

 and accessory sensoria are present. On III there are from thirty-five 

 to forty-five circular secondary sensoria; on IV from five to fifteen 

 secondary sensoria. These two segments appear tuberculate. The 

 beak reaches beyond the second coxae. The cornicles are longer than 

 the cauda, and subequal in length to the fourth antennal segment. 

 They are subcylindrical and fairly stout. The cauda is long and ensi- 

 form, reaching to the tip of the cornicles. The wings and venation 

 are normal. 



Measurements (of three specimens) : Body length, 1.836 to 1.955 

 mm. ; width of thorax, 0.765 to 0.833 mm. ; antennae, total, 2.805 to 

 2.992 mm. ; III, 0.680 to 0.697 mm. ; IV, 0.441 to 0.527 mm. ; V, 0.391 

 to 0.425 mm. ; VI, base 0.085 to 0.119 mm. ; VI, spur 0.952 to 1.105 

 mm. ; cornicles, 0.441 to 0.493 mm. ; cauda, 0.238 to 0.272 mm. ; hind 

 tarsi, 0.136 to 0.153 mm. ; wing, length, 3.145 to 3.315 mm. ; width, 

 0.952 to 1.139 mm. ; expansion, 7.36 to 7.87 mm. 



72. Macrosiphum ludovicianae (Oestund) 



Figures 136, 148 



Oestlund, Minn. Geol. Nat. Hist. Surv., vol. 14, p. 23, 1886. Siphonophora 



(orig. desc.). 



Davidson, Jour. Econ. Ent., vol. 7, p. 136, 1914 (list). 

 Wilson, Trans. Am. Ent. Soc., vol. 12, p. 98, 1015 (desc.). 



