178 THE STUDY OF INSECTS. 



these are attached to stones or other objects overhanging 

 the water. They are laid in blotch-like masses, which are 

 chalky-white in color, and measure from half an inch to nearly 

 an inch in diameter. A single mass contains from two thou- 

 sand to three thousand eggs. When the larvae hatch they 

 at once find their way into the water, where they remain 

 until full grown. 



There are other common species of the family which 

 closely resemble Corydalis but are smaller, the larger ones 

 measuring less than two and a half inches in length, and 

 having a wing expanse of not more than four inches. These 

 insects also differ from Corydalis in having three ocelli and 

 in lacking the sharp tooth-like angles on the sides of the back 

 part of the head. See Figure 215 of the adult Corydalis. 

 These species belong to the genus Chauliodes (Chau-li'o-des). 



Chauliodes pecticornis (pec-ti-cor'nis) is a common species 

 with grayish wings and feather-like antennae. Chauliodes 

 serricornis (ser-ri-cor'nis) is also common ; this is a brownish- 

 black species with the wings spotted with white, and with 

 serrate antennae. 



Family RAPHIDIID^E (Raph-i-di'i-dae.) 

 The RapJiidians {Ra-phid 1 i-ans). 



The members of this family are found in this country 

 only in the far West. They are strange-appearing insects, 

 the prothorax being greatly elongated, like the neck of a 

 camel (Fig. 217). The female bears a long, 

 slender, sickle-shaped ovipositor at the end 

 of the abdomen. The fore legs resemble 



FlG. 217. — Raphidia, . ... . 



female. the other pairs of legs, and are borne at the 



hinder end of the prothorax. 



The larvae are found under bark and are carnivorous. 

 We have found them common under the loose bark of the 

 Eucalyptus. They also occur in orchards, and doubtless do 

 good by destroying the larvae and pupae of the Codlin-moth. 



