462 



Ser. A, iii, p. 652 ; iv, p. 92] is erroneous, the author obtained 

 from Trinidad several specimens, undoubtedly belonging to this 

 winged species, which has been variously determined as *S. peregrina, 

 S. americana and S. paranensis. These determinations are said to 

 be incorrect, the species being a new one which is described here as 

 Schistocerca urichi. This is certainly the locust invading Colombia 

 and Venezuela and is probably the one which invades Central America. 

 The original breeding place probably lies in the highlands of Guatemala 

 or in the plains between Guatemala, Mexico and Belize. It is 

 probably also the species found in Yucatan and believed by d'Herelle 

 to be S. americana, though the author admits that a male example 

 sent him by d'Herelle does not agree with S. urichi and appears to 

 belong to an unindentified species. The sub-permanent regions of 

 distribution of S. urichi therefore include Yucatan and the republics 

 of San Salvador and Honduras, while the regions temporarily invaded 

 include the republics of Nicaragua, Costa Rica, Panama, Colombia, 

 Venezuela, northern Ecuador (sometimes), the Guianas, and the 

 northern parts of the Brazilian States of Amazonas and Para. The 

 invasions occur in the dry season, from May to August, and the exodus 

 of the new winged individuals is towards the north or the west 

 (according to the country where they were bred) in order to concentrate 

 in their country of origin. According to existing data the normal 

 time of incubation of the eggs of S. urichi is 14 days in Yucatan, 20 

 in Costa Rica and 25 in Venezuela and the total life-cycle requires 

 54 days in Yucatan, 76 in Costa Rica and 90 in Venezuela. The 

 newly hatched larva is white in colour, the hopper being reddish 

 and yellowish with black markings. 



In an addendum the author remarks that the above paper was 

 completed before he was aware that Rehn had identified the Vene- 

 zuelan locust as S. paranensis and published his finding in March 1913 

 in the Proceedings of the Academy of Natural Sciences of Philadelphia 

 (Ixv, pp. 82-113). He points out that Rehn there admitted the 

 occurrence in Venezuela of two different species of migratory Schisto- 

 cerca, for he identified one specimen from that country as S. peregritia, 

 Oliv., though he afterwards expressed a contrary opinion. The 

 author concludes by suggesting that this latter specimen should be 

 examined again. 



Brethes (J.). Description d'une nouvelle Dexiinae argentine. [Des- 

 cription of a new Dexiine from Argentina.] — Physis, Buenos Aires, 

 iv, no. 16, 15th May 1918, p. 115. [Received isth August 1918.] 



A fly recently collected at Cordoba is here described as Hystrichodexia 

 pueyrredoni. It probably is a parasite of Lepidopterous larvae and 

 therefore beneficial. 



GouGH (L. H.). Notes on an Ephestia, an Insect injurious to stored 

 Dates in Khargeh Oasis. — Separate, dated 1918, from Bull. Soc. 

 Entom. d'Egijpte, Cairo, 1917, pp. 133-140, 1 plate. [Received 

 20th August 1918.] 



The date crop of Khargeh Oasis is damaged to a considerable 

 extent each year by larvae of Ephestia sp. Investigations in 1917 

 showed that growing dates are not attacked by these larvae, but 

 only fallen or gathered fruit. The eggs are laid singly or in groups 



