68 HYMENOPTEEA. 



Pam. SIEICID-3S. 



Subfam. SIRICINA. 



SIREX. 



Sirex, Linnaeus, Faun. Suec. p. 396 (1761); Klug, Mon. Sir. Germ. p. 19 (1803). 

 Urocerus, Geoffrey, Ins. Par. ii. p. 264 (1762). 



This well-known genus is numerously represented in the Palsearctic and Nearctic 

 Regions, and species are also known from China, India, and Australia ; but no species 

 have hitherto been recorded from South America, or from the Ethiopian Region. 



1. Sirex flavicornis. 



Sirex flavicornis, Fabr. Spec. Ins. i. p. 418. 4 (1781). 

 Hab. North America ; Mexico. 



There is a specimen of this species in the Hope Museum, Oxford, with the locality 

 " Mexico." It is common in North America. 



2. Sirex Mvus. 



Urocerus fulvus, Cresson, Trans. Amer. Ent. Soc. viii. p. 35 (1880) 1 ; Kirby, List of Hymen, i. 

 p. 379 2 . 



Hab. North America 1 , Western States. — Mexico 2 . 



Subfam. XIPHYDRINA. 



DERECYRTA. 



Derecyrta, Smith, Ann. Nat. Hist. (ser. 3) vi. p. 255 (1860) ; Westwood, Thes. Ent. Oxon. p. 121 



(1874). 



This genus is exclusively Neotropical, and only four species have hitherto been 

 described. It diners from Xiphydria merely in having only one radial cellule, and in 

 having the ovipositor somewhat shorter ; but this last point can scarcely be regarded 

 as of generic value. The maxilla is constructed as in the Tenthredinidse ; the palpi 

 are 5-jointed ; joints one and three are the shortest, and nearly equal in length ; joint two 

 is the longest, and the fifth is a little longer than the fourth. The labium is apparently 

 entire ; the palpi have three joints. The basal is longer than the second, and both are 

 much thinner than the third, which is more than double their thickness, and as long 

 as the first. 



l. Derecyrta rugtfrons. (Tab. III. fig. 13.) 



Nigra, alis fere hyalinis, apice lenissime fumatis; facie mesonotoque punctulatis ; alis cellula cubitali 



secunda longiore quam tertia. 

 Long. 17-18 millim. 



Hob. Costa Rica, Irazu, 6000 to 7000 feet (Rogers). 



