INSECTS AFKECTINC. I'ARK AND WOODLAND TREES 



l8l 



pupa April 22 and by the 28th the anal filaments had begun to protrude 

 and Ma)- i the adult emerged. May 18 the females had increased greatly 

 in size, indicating that impregnation had taken place, and on the 22d they 

 began to move from the young branches out on the twigs and on the 23d 

 one had reached the underside of the leaf and had commenced to form its 

 ovisac. Within 24 hours the extruded white wax formed a nearly complete 

 circle about the insect, and 48 hours later it had reached a length of ij'5 inch, 

 and was distinctly divided from the first secretion by a deeply impressed 

 line. The first wax extruded contained no eggs, but the real ovisac, com- 

 prising the last ' r, inch was full of eggs which hatched June 13, and thus 

 completed the life cycle. 



Fig. 26 P u 1 V i n a r i .1 a c e r i c o 1 .t : <i = full grown female, fr 

 of egg sac ; *— s.ime, with egg s,ic completed, from side; c 

 Howard. U. S. Dep't Agiic. Di». Ent. Bui. 22, n. s. 1900) 



Natural enemies. The only enemy observed by Dr Howard at Wash- 

 ington was a small ladybug, H)peraspis si gnat a Oliv., which was 

 received in the larval condition from Knoxville Tenn. The lar\a of this 

 little beetle is very interesting on account of its resembling the larva of a 

 mealy bug [fig. 27]. It, or an allied species, was met with by the writer in 

 1901. Prof. R. H. Pettit, who collected the insect at Ithaca in 1893, reared 

 six parasites which w-ere determined by Dr Howard as follows : A p h y c u s 

 hederaceus Westw., Aphycus flavus How., Coccophagus 



