588 PROF. WESTWOOD ON SOME 



J. Lubbock distinctly describe tbe tarsi as 4-jointed, the latter adding that the fourth 

 segment (pi. xxiii. fig. 15) is in all the legs very small. Referring to my genus Tricho- 

 gramma (as described in Mr. Taylor's ' London and Edinb. Phil. Mag. ' 1833, p. 444), in 

 which the tarsi are described as 3-jointed, — a description which was adopted and 

 confirmed by Mr. Haliday, one of the clearest-sighted of entomologists, — Sir J. Lubbock 

 is " disposed to consider that the tarsus in Trichogramma is in reality 4-jointed, and 

 that Westwood and Haliday's descriptions must be amended" (p. 141). Now, whoever 

 has studied these minute Hymenoptera is well aware that in many of them the 

 pulvillus of the tarsi is greatly enlarged, having the ungues affixed at the sides towards 

 the base, the tarsus itself being only 3-jointed (see, for example, the figures of the 

 tarsi of the Chacidideous genera published by Mr. Curtis in his ' British Entomology,' 

 especially those of Eulophus, pi. 133 ; Encyrtus, pi. 395 ; and Phagonia, pi. 427 ; and 

 I have not the least hesitation in affirming, from the inspection of Sir J. Lubbock's 

 figures 10, 11, 14 & 15, that the tarsi of Prestwichia are only 3-jointed, with an enlarged 

 pulvillus, as more distinctly shown in fig. 15. This character, therefore, also removes the 

 genus from the Mymarides — amongst which it is arranged by the Rev. T. A. Marshall in 

 his ' Catalogue of British Hymenoptera Oxyura,' between Cosmocoma (Polynema) and 

 Caraphractus. 



The structure of the fore wing of Prestwichia is also indicative of a similar want of 

 relation with the Mymarides. As will be noticed by comparison of the figure of its wing 

 (fig. 13) with those of Polynema (fig. 4) and Anaphes (fig. 8), without dwelling on the shape 

 of the wing and its rounded extremity, it will be seen that the thick subcostal vein 

 extends half the length of the anterior margin of the wing, where, at its apical extremity, 

 "it turns inwards and ends abruptly" — a character never found in the Mymarides. 

 Sir John Lubbock, as above stated, has referred to my genus Trichogramma ; and I 

 cannot but think that Prestwichia belongs to the little group of which the former genus 

 is the type, and which Eoerster has formed into his family Trichogrammatoidse (Hym. 

 Studien, Heft 2, p. 87). In my original description of Trichogramma I described the 

 antennae thus : — " breves, 6-articulat8e, articulo lmo longo, 2do brevi, gracili, 3tio quam 

 2do majori, crassiori, 4to et 5to brevibus, 6toque maximo oblongo-ovato apice acuminato," 

 accompanied by a figure both of the antenna and the 3-jointed tarsus. More recent 

 examination of the antennas leads me to think that the supposed second joint is only 

 the narrowed extremity of the long basal joint (as represented in the accompanying 

 Plate LXXIII. fig. 12) ; nor am I clear that the large oval apical joint is not in reality 

 composed of two or three joints closely soldered together. The most remarkable cha- 

 racter of Trichogramma consists of the curious mode in which the fine hairs of the 

 fore wings are arranged in lines, of which I am not aware of any similar instance 

 throughout the order Hymenoptera. Plate LXXIII. fig. 13, represents the fore wing of 

 Trichogramma evanescens, of which no figure has hitherto been published ; and it will 

 be seen that Prestwichia differs from it in having the fine hairs scattered over the 

 wing irregularly. 



In the Entomological Magazine (vol. i. p. 340, July 1833) Mr. Haliday published the 

 description of a new genus with trimerous tarsi, under the name of Calleptiles (giving 



