Pomona Journal of Entomology 



Vol I 



MARCH 1909 



Number 1 



APHIDIDAE OF SOUTHERN CALIFORNIA I 



E. O. ESSIG. 



Under this title we propose to make an extended series of studies on the 

 plant hce found in Southern CaHfornia, with the hope that they may eventually 

 be gathered in a complete manual of the group for this region. Many of the 

 earlier species and even generic references must of a necessity be merely 

 tentative, all of our knowledge of the group in America being, so far, extremely 

 fragmentary. 



Lachniis californicus, n. sp. 



Winged Viviparous Femiale. — Length 1.6 mm., width 0.5 mm., 



wing expansion 5.3 mm. Prevailing color — green, but individuals are found 



varying all the way between green and brownish-yellow. The eyes and 

 abdominal dots are red. (Figure 1.) 



Figure 1. Lachnus californicus 



Head — Short and nearly as wide as thorax, with short hair on frontal 

 margin between the antennae. Compound eyes — large, round, red. Anten- 

 nae (Figure 5, K) arise from no frontal tubercles, somewhat darker than the 

 body, shorter than body 0.67 mm. long, six-jointed, hairy, with an apical nail- 

 like process on the fifth article. The lengths of the respective articles are : 

 I 0.07 mm., II 0.08 mm.. Ill 0.26 mm., IV 0.13 mm., V 0.13 mm. The sensoria 

 are distributed as follows: 1 and II none, III four large and one small cir- 



