10 NEW CALIFORNIAN APHIDIDAE 



entirely unknown, and specimens were sent to H. F. Wilson, E. 0. 

 Essig, and Harold Morrison. The first two were unacquainted 

 with the species, and ]\Iorrison wrote as follows concerning it: 



''As I suspected when I first saw your specimens, they are the 

 same thing that Davidson called Lachnus abietis Fitch in his 

 earlier papers. On comparing them with his specimens I can 

 find only a few differences in the number of sensoria and in the 

 relative lengths of segments IV and V of the antennae." 



On the strength of this statement the writer lists Lachnus 

 abietis Fitch of Davidson as a synonym of this species, which 

 he describes herewith as Lachnus ferrisi new species, naming it 

 after G. F. Ferris of Stanford University. Cotype specimens 

 are in the writer's collection under the serial number AFS 72-15 

 and in the collection of the University of California. 



Alate viviparous female. — Prevailing color dark browTi to black, slightly 

 pruinose. Head black or dark brown, eyes red. Antennal segments I and 



11 dusky-yellow, III dusky with the base pale, IV dusky with the basal one- 

 half pale, V pale with the tip dusky, YI dusky except a very small area near 

 the base which is pale. Beak pale with the two apical segments dusky. 

 Thorax dark broTATi, thoracic lobes black. Abdomen dusky amber to brown 

 with two rows of marginal black spots. Cornicles black, cauda and anal plate 

 concolorous with the abdomen, except the distal edges which are black. Coxae 

 dark-brown, femora luteous at bases shading into black at apices, tibiae and 

 tarsi black. In some cases there is a narrow amber-colored ring near the 

 base of the tibiae. This may be present on any of the tibiae, particularly on 

 the middle; it may be present on all of the tibiae; or it may be entirely absent. 

 This is a character that is often met with in various species of Lachnus. 

 Wings normal with the veins yellowish or brownish gray, stigma gray. 



Head (fig. 3) about twice as broad as long, eyes very prominent, being 

 placed on distinct tubercles. Antennal tubercles lacking. Antennae (fig. 

 18) reach to the base of the thorax, and are furnished with many fairly long, 

 stiff hairs. Ill is the longest segment, followed in turn by V, IV, VI, I, and II. 

 V is a little less than one-half as long as III, IV being but slightly shorter than 

 V. In a few cases IV is longer than V. VI is about one-half as long as IV 

 or V, the spur being but a short thumb-like process (fig. 18), as is typical of 

 the Lachnini. On V and VI (fig. 18) there are the usual primary sensoria, 

 and on VI the usual accessory sensoria. On segment V there are, in addition to 

 the primary sensorium, one or two secondarj^ sensoria located in the apical 

 one-third of the segment, not far from the primary sensorium. Usually there 

 is but one of these secondary sensoria. Of sixteen segments examined, fourteen 

 had but one secondary sensorium, while two had two such sensoria. On 

 segment IV (fig. 18) there are from thi-ee to six secondary sensoria, the 

 modal number being four-. Of seventeen segments examined, three had thi-ee 



