248 Mr. J. O. Westwood on Evania and 



two posterior tarsi is very short, the fourth also is short and some- 

 what dilated, the tei-minal joint being inserted before the extremity 

 so as to sit obliquely. The antennae, which are described by 

 Fabricius (Syst. Piez. p. Ill) as 12-jointed, and by Latreille 

 (Gen. Cr. 3, 255) as 13-jointed, are distinctly 14-jointed in each 

 sex, the basal joint being short and thick, the second much shorter 

 and cup-shaped, and the remaining twelve long, very slender, and 

 cylindric. In both sexes they are annulated with white near the 

 extremity. 



The parts of the mouth of this genus not having hitherto been 

 figured, I have thought it might be serviceable to add figures of 

 them, more especially as it will be seen that the descriptions given 

 both by Fabricius and Latreille in the works above quoted (and 

 copied by Saint Fargeau and Serville into the Encyclopedie Me- 

 thodique, vol. x. p. 29) do not at all correspond with my figures.* 

 Thus Fabricius describes the mandible as " intus tridentata, apice 

 acuta." Latreille states the maxillary palpi to be 6-jointed, and the 

 labial 4-jointed, whilst Fabricius describes the same organs as being 

 respectively 5-jointed and 4-jointed ; whereas they are in fact re- 

 spectivelyf 5-jointed and 3-jointed. (Plate XIV. fig. 2a, represents 

 the head of the female seen in front ; 2 b, the same seen side ways ; 

 2c, the labrum ; 2d, the mandible; 2e, the maxilla; and 2f, the 

 labium and its palpi.) The neuration of the wings in this genus 

 is very unlike that of any other Hymenopterous genus, as will be 

 seen from my figure ; in which the parts dotted are only very 

 slightly indicated, and can be seen only by shifting the wings in 

 various directions. With the view of exhibiting the manner in 

 which the variation in the position of the veins in this and several 

 allied genera is effected I have given a figure of the wing of 

 Pelecinus, PI. XIV. fig. 1«, and have added figures of those of 

 Monomachus (PI. XIV. fig. 5a), Fcenus (PI. XV. fig. 2), and 

 Proctotriipes (PI. XIV. fig. 10); the last named genus being con- 

 sidered by Dr. Erichson as brought into close relation with Pele- 

 cinus by means of Monomachus. The analogous veins in the figures 

 of the wings are similarly lettered. That Proctotriipes is indeed 

 closely allied to Pelecinus is perhaps unquestionable ; ;|; and, in 



* Of the correctness of these figures I will only observe, that they have been 

 made from an examination of many female specimens of Pel. politurator, and 

 from actual dissection of two individuals. 



t It appears to me that Latreille has mistaken a slight swelling near the base 

 of the fouith joint for an articulation. 



t P.Ir. Haliday (Ilym. Synops. li. in Hyni. Brit. Alysia) has formed Pelecinus 

 into a family of the Oxijiini, separating it fiora the Evuidadic on account of its 

 trochanters being exarticulated. 



