﻿270 POMONA COLLEGE JOURNAL OF ENTOMOLOGY 



in its work, being a slower spreader and requiring more attention in this 

 respect." By E. K. Carnes. 



Extracts from Pomological Bulletin Vol. No. 2 : 



"Peculiar conditions in San Diego county have enabled the most efficient 

 predatory insect attacking mealy bugs in California, Cryptolaemus montrou- 

 cieri, to become firmly established in that region, so much so that it can be 

 collected in numbers practically all the year round, experience has also show 

 that in perhaps three years out of four its work is as complete in that 

 region as that obtained by any mechanical means of control, thus I consider 

 Mr. Allen justified in the course he has decided to adopt. It is further 

 true that in this same locality of which I have just been speaking, as 

 recently as the 14th of last October, when C. montrousieri had increased in 

 such numbers that I was able to obtain 1,000 in the space of an hour, and when 

 the work of cleaning up the mealy bugs was considered remarkable, there were 

 more mealy bugs on each tree in this orchard than there are in the entire 

 infestion here at Claremont."' pjy Frederick Maskew. 



Rhi/obius ventralis 



Eggs — Are small, cylindrical, and pointed. They are deposited in egg- 

 masses and among the mealy bugs. In the case of black scale, they are 

 deposited under the adult female shell — usually few at a place. 



Larvae (Fig. 108 A) — Hatch from the eggs some two weeks from the 

 time of deposition. The first born are very small and somewhat inactive. 

 Form, oblong and somewhat narrow ; tapering towards the tail-end. Length 

 of average 6 mm., width 2.5 mm. Color, dark brown to black. Body very 

 rough because of many small ridges, and large spine areas. The spine areas 

 are located as follows : Lateral areas — two extremely large areas on each 

 abdominal segment, these are also present on the margins of the prothorax, 

 mesothorax and metathorax ; two smaller spine areas on all of the abdominal 

 segments, and two large areas on the prothorax. mesothorax and metathorax. 



Dorsal areas — Two median areas on all of the first eight abdominal seg- 

 ments, and a large area on the ninth. 



The spines are all simple. On the median spine areas, there are two 

 large spines and several smaller ones ; on the remaining areas there are 

 numerous large and small spines. The rough skin is shown in the enlarged 

 drawing of the spine area. The entire body is covered with the short spines. 

 Around the spine areas the color is somewhat lighter than the body, as is 

 also true of a streak down the middle of the thorax. This streak forks 

 at the base of the head, each fork extending to the lateral margin just back 

 of the eye. A dark streak extends down the middle of the dorsum. The 

 ventral side is a dark yellow color. When disturbed, the larvae emit a sticky 

 yellow fluid. Head shorter than thorax, and half as wide, very dark in 

 color; covered with spines. Antennae three-articled. Article I as long as II 

 and III; twice as wide as II; and many times as wide as III. Article III 

 not as long as II, and half as wide; with a long spine at apex. Article II has 

 a large, stout spine arising at its apical end beside article III. This spine 



