50 MISCELLANEOUS STUDIES 



53. Lachnus taxifolia Swain 



Figures 99-103 

 Swain, Trans. Am. Ent. Soc., vol. 44, p. 11, 1918. 



Eecords. Pseudotsuga taxifolia, Sacramento (Essig), Berkeley and San Fran- 

 cisco (Shinji). 



This is a fairly qommon species found in colonies on the branches 

 and trunks of Douglas fir in the San Francisco Bay and Sacramento 

 Valley. It is interesting particularly because of the atrophied cor- 

 nicles. 



54. Lachnus tujafilinus (Del Guercio) 



Figures 93, 105 



Del Guercio, Eedia, vol. 5, p. 287, 1909. Laclmeilla (orig. desc.). 



Essig, Pom. Jour. Ent., vol. 3, p. 541, 1911. Lachnus juniperi DeGeer 



(desc.). 

 Essig, Pom. Jour. Ent., vol. 4, p. 773, 1912. Lachnus juniperi DeGeer 



(list). 

 Davidson, Jour. Econ. Ent., vol. 7, p. 127, 1914 (list). 



Eecords. Thuya occidentalis, Claremont, Santa Paula (Essig); Palo Alto, 

 Walnut Creek (Davidson); Stanford University, March, 1912 (Morrison); San 

 Diego, March, 1916; Riverside, October, 1916, March, 1917. 



This oddly marked Lachnus is more or less common throughout 

 California wherever arborvitae is cultivated. The apterous females 

 are the most common, and are easily recognized by the odd markings 

 on the dorsum of the abdomen (see Essig 's illustrations). Occasion- 

 ally the alate females are found, Davidson finding some in April, 

 Morrison and the author in March. The author has observed the 

 larvae of Coccinella calif ornica feeding on them in Riverside. 



55. Lachnus vanduzei n.sp. 



Figure 88 

 Records. Picea sp., Berkeley, September, 1914 (Essig, E. P., Van Duzee). 



In September, 1914, E. P. Van Duzee collected a few specimens 

 of a large Lachnus on a species of spruce in Strawberry Canyon, near 

 Berkeley. Later in the same month Essig found specimens on the 

 same tree. The following fall the author hunted for the species, 



