1918] ECONOMIC ZOOLOGY ENTOMOLOGY. 465 



The species is remarkably free from parasitic enemies, Pimpla pedalis being 

 tlie only one recorded. While the injury by this pest is intensive and not ex- 

 tensive, it is due to the gregarious larvae of the early stages which strip 

 brandies and sometimes small trees of their foliage and the injury to young 

 trees may be quite severe. It may be controlled readily by spraying with 

 arsenicals ; orchards which have been tlioroughly sprayed for the codling moth 

 have never been observed to be infested. The caterpillars soon become very 

 hard to poison and large amounts are required to kill them in the later stages. 



A list of 19 references to the literature is appended. 



The quince boi-er and its control, F. W. Pettey {Union So. Africa .Dept. 

 Agr. [Puh.'\ 2 {1917}, pp. 17, figs. 10). — A detailed account of Coryphodema 

 tristis, a lepidopteran of tlie family Cossidse, which is distributed all over 

 Cape Province wherever quinces or Wemmershoek apples are grown, but which 

 is not known to occur in any other country. Serious damage is done by 

 killing the branches infested by it or by impairing the bearing capacity of tlie 

 whole or of parts of the tree. 



Moth borers affecting- sugar cane in Mauritius, D. d'Emmerez de Charmoy 

 {Dept. Agr. Muuritius, Sci. Ser. Bui. 5 {1917), [English Ed.], pp. 27, pis. 7).— 

 Summarized accounts are given of the pink borer {Sesamia vuteria), the 

 spotted borer {Proceras sacchariphaga) , the white borer {Grapholita schis- 

 taceana), and the brown borer {Alucita sacchari). Descriptions of pan'sites 

 of these species are appended. 



The sweet potato leaf -folder, T. H. Jones {U. S. Dept. Agr. Bui. 609 {1917), 

 pp. 12, figs. 4)- — This is a report of studies at Baton Rouge, La., of the pyralid 

 moth Pilocrocis tripunctata, tlie larva of which was first observed to be an 

 enemy of sweet potatoes in Louisiana in 1914. While it has not as yet been 

 observed to occur in destructive abundance in that State, it was very injurious 

 to the sweet potato near Brownsville, Tex., during tlie fall of 1916, where con- 

 trol experiments with poisons were conducted by M. M. High, a complementary 

 report of which is incorporated in this account. 



In addition to Louisiana and Texas the species is recorded from Mexico, 

 Jamaica, Cuba, and Grenada, West Indies, and has previously been observed by 

 the author on sweet potatoes in Porto Rico (E. S. R., 33, p. 59). 



Technical descriptions are given of its several stages. In addition to the 

 sweet potato the moth lias been reared from larvte found feeding on unculti- 

 vated plants of the genu* Ipomoea, such as bindweed, wild sweet potato, and 

 wild morning-glory. 



At Baton Rouge during the latter part of July and first of August four 

 days are i-equired for the incubation of the egg. In the field the larvae are 

 found between separate leaves or portions of the same leaf which have been 

 fastened together to form " shelters," each of which usually protects one larva. 

 While tlie number of larval molts varies, there are usually six, for the develop- 

 ment of which 3 days are required for the first instar, 2 days each for the 

 second, third, fourth, and fifth instars, and 5 days for the sixth instar. In the 

 field and in the insectary tlie pupre normally are found in loose cocoons within 

 the shelters made by the larvae, from 6 to 9 days being required for tlieir 

 development. Hibernation appears to take place in the larval stage. The 

 minimum period required for the vai'ious stages at Baton Rouge are egg stage 

 4 days, larval stages 13 days, prepupal stage 2 days, and pupal stage 6 days, 

 or a total of 25 days. 



The tachinid fly Exorista pyste and an ichneumonid {Bassus sp.) have been 

 reared from collections of larvae made in the field at Baton Rouge. Spraying 

 experiments reported indicate that the larvae can be killed readily by timely 



