243 



pilosus, Bks., destroys red spider on Lechea villosa and on Boston ivy, 

 and the mite, Anystis agilis, Bks., has been collected on infested 

 elderberry and violets. 



Thysanoptera. Scolothrvps sexmaculatus, Perg., is a voracious 

 feeder on red spider, particularly in the egg-stage, and is itself destroyed 

 by Triphleps insidiosus. Euthrips fuscus, Hinds, and E. occidentalisy 

 Perg., have also been collected in red-spider colonies and are believed 

 to be predatory on the mites. 



Rhynchota. The Anthocorids, Triphleps insidiosus, Say, and 

 T. tristicolor destroy red spider ; they pass the winter in the adult 

 stage and usually become active some time in April ; they are at 

 their maximum in July, hibernating in October. The Lygaeid, 

 Geocoris punctipes, Say, the life-history of which is given in a table, 

 deposits eggs in the midst of red-spider colonies on cotton leaves, 

 the newly-hatched nymphs readily devouring both spiders and eggs. 

 This bug is parasitised by the Scelionid, Telenomus sp. A nymph 

 of the Capsid, Rhinacloa forticornis, Rent., was observed in red-spider 

 colonies in a cotton field feeding on the mites, and in a rearing cell 

 ate on an average 60 mites a day. A Reduviid bug occurs abun- 

 dantly both in the nymphal and egg stages in red-spider colonies on 

 tomato leaves and a nymph placed in a breeding cell destroyed an 

 average of 12 spiders a day. 



Neuropterous enemies include Chrysopa rufilabris, Bks., the 

 life-history of which is given in tables ; this species exerts a marked 

 control over red spider during August. It is itself parasitised' some- 

 times to the extent of 55 per cent., by various enemies, including 

 Chrysopophagus compressicornis, Ashm. , Perilampus chrysopae, Crawf . , 

 Geniocerus chrysopae, Crawf., Isodromus iceryae. How., Orthizema. 

 atriceps, Ashm., and Heloris sp. Telenomus chrysopae, Ashm., was 

 reared from an egg. Other Chrysopid enemies are Chrysopa quadri- 

 2)unctata, Burm., C. ocuJata, Say, and C nigricornis, Burm. 



Dipterous parasites include the Cecidomyid, Arthrocnodax Carolina, 

 which destroys red- spider eggs in large quantities during August and 

 September. Tables dealing with its Ufe-history are given. It is 

 itself parasitised by the Chalcidid, Aphanogmus floridanus, Ashm. 

 Another predaceous Cecidomyid is Mycodiplosis macgregori. Felt, 

 which greatly resembles A. Carolina, but appears somewhat later. 

 Syrphid flies are incidental enemies of red spider, the species most 

 commonly found among the mites being Baccha clavata, F., Allograpta 

 obliqua, Say, Sphaerophoria, cylindrica, Say, and Toxomerus dupli- 

 catus, Wied. Enemies of these Syrphids are : Chrysopophagus 

 compressicornis, Ashm., Pachyneuron allograpkie, Ashm., Syrpho- 

 phagus - rnesograptac, Ashm., Tetrastichus sp. and Diplazon kieta- 

 torius, F. 



Among Coleoptera, the Coccinelhds, Pentilia sp., Stelhortis punctam, 

 Le3., S. nanus, IjeG.,S. marginicolUs, Maun., are all predaceous enemies, 

 S. punctum being sometimes so abundant as to exterminate colonies 

 of red-spider. *S. utilis, Horn, is a voracious feeder on the red-spider on 

 cotton. The life-history of this species is given in the form of a table. 

 Stethorus picipes, Scymmis collar is, Melsh., Microweisea tniselh; Lee, 

 Megilla maculaia,DeG., Hippodamia convergens, CTuer.,and Coccinella 

 novemnotata, Hbst., have all been recorded as assisting in the control 

 of red-spider. 



