On new Hymenopterd from Central America. 261 



first being considered by Mr. Tosli * as the yoiino; of the 

 season at five and a lialf months. Tt would be difficult to 

 separate that at 65 millim. from the same series, but one at 

 %5 is considerably older, probably by a year (or, as Mr. Tosh 

 puts it, one year and three months). The usual arrangement 

 of the spines on the gill-cover in such forms is as follows : — 

 A spine points downwards at the ventral edge of the preoper- 

 culum, two short spines project above, then the upper long 

 spine, above which is the opercular spine. Two short spines 

 occur on the suboperculum, 



Tiiose of 57 and lA: millim. in February represent speci- 

 mens about a year old, while those of 98 millim. are in their 

 second year or approaching it. One of these (98 millim.) 

 had almost ripe eggs, so that the remark in the new edition 

 of the * Scandinavian Fishes,' that it does not propagate its 

 species until about 150 millim. long, is not applicable to our 

 country. 



XXV. — New Species of Hymenoptera from Central America. 

 By P. Cameron, F.E.S. 



During the course of publication of my work on the Hymeno- 

 ptera of Central America (Biol. Centr.-Am., Hymen, vols, i., 

 ii.) the following new species have come to hand, too late to 

 be inserted in their proper places. As it will be some time 

 before the Supplement of the ' Biologia ' can be commenced, 

 it is considered advisable to publish the following preliminary 

 descriptions. 



Fam. Cynipidse. 

 Andricus. 



Andricus, Hartig, in Germar's Zeitschr. ii. p. 185. 

 Aphilothrix, Foerster, Verb, zool.-bot. Ges. Wien, 1869, p. 335. 



This is a dimorphic genus, Andricus being the spring 

 bisexual and Aphilothrix the autumnal agamic (unisexual) 

 form. 



Andricus {Aphilothrix) aztecus, sp. n. 



Aphilothrix {?) aztecus, Cameron, Biol. Centr.-Am., Hymen, i. t. xx. 

 fig. 23. 

 Ferrugineus ; alia hyalinis, nervis pallide flavis. 

 Long, fere -4 millim. $ . 



Ilab. Mexico, Northern Sonora {Morrison). 



* Twelfth Ann. Report Scot. Fish. Board, part iii. p. 333. 



