44 BULLETIN 416, U. S. DEPARTMENT OF AGRICULTURE. 
NEUROPTERA. 
CHRYSOPIDAE. 
Four species of lacewing flies have been collected during the in- 
vestigation at Batesburg. Lacewing flies are frequently seen on 
cotton leaves associated with common red spiders. Only one species, 
Chrysopa rufilabris Banks, is very abundant in South Carolina. 
Chrysopa rufilabris Banks.—This species appears in late spring or 
early summer, the earliest record being May 6, 1914, on which date 
eggs and larve were seen. Together with the thrips, this chrysopid 
appears to be the earliest red-spider enemy. When an early season 
prevails, this predator becomes abundant about the middle of June, 
but, as a rule, this does not take place until July. Itis not as hardy as 
are some of the more coriaceous enemies of the red spider, and seeks 
winter quarters comparatively early in the season. In fact, the 
species reaches its optimum development during August, and is rarely 
seen in any stage later than September 25. This red-spider enemy 
is recorded from Emporia, Va.; Wilmington, Greensboro, Charlotte, 
Buies, and Laurinburg, N. C.; Spartanburg, St. Matthews, Lees- 
ville, Batesburg, and numerous points in South Carolina; Savannah, | 
Ga.; Tallahassee, Fla.; Girard, Ala.; and Dallas, Tex. 
At certain times during the season Chrysopa rufilabris has been 
seen to exert marked control of the red spider, and its value as an 
enemy of the cotton red spider can hardly be overestimated. Dur- 
ing June, 1914, from the 10th to the 22d, lacewing-fly larve were 
abundant, crawling in myriads on tree trunks, the ground, the 
ceilings of porches, and similar positions. At these times man 
experiences much annoyance from the mandibles of larvae which 
drop from piazza ceilings. | 
Tables XIII, XIV, and XV present data on the life history of 
Chrysopa rufilabris. 
TasLeE XIII.—Egq period of Chrysopa rufilabris, Batesburg, S.C. 
| 
| Indi- Incuba- 
| vidual | Bee col |Hatched.!} tion 
No. 7 period. | 
| Days. | 
1 | June 8/ June 11 331 
2 | July 15} July 18 Ss 
3 | July 15| July 18 3) |] 
4 | Aug. 3] Aug. 8 5 | 
5 | Aug. 3); Aug. 58 Daal 
6 | Aug. 9 | Aug. 13 2 a 
Average. - .-_-- 4 | 
| 
1 These 6 rearings are the longest of a large series and probably represent about the normal period for this 
stage. 
