HYMENOPTERA — MUTILLIDE. 915 
M. Van der Linden, however, ascertained that these genera were but 
the sexes of the same species (Ann. Sci. Nat. Jan. 1829, and Bull. 
Ferussac, April 1830) ; and Dr. Burmeister has captured the male on 
the wing, carrying the female during flight. (Manual, transl. p. 327.) 
Mr. R. H. Lewis has also sent me specimens of a male Thynnus 
variabilis and female Myrmecoda, from Van Diemen’s Land, captured 
by himself iz copula, thus confirming the relations of these two sup- 
posed genera. Klug also mentions the same fact in the Abhand1. der 
Akad. der Wessensch. 1831, p. 307. The same occurs also in the 
genus Scotena Klug, of which males only have been described ; the 
insect figured by Perty (Delectus An. art. Bras. tab. xxvii. f.10.), 
under the name of Myrmecoda varia, being a female of the latter 
genus. Mr. Shuckard also considers that the insect which he has 
described in the Trans. Entomol. Soe. (vol. ii. pl. 8. f. 1.) under the 
name of Psamatha chalybea, may be the male of my genus 
Diamma. 
The exotic genus Apterogyna Dalm. is remarkable for the great 
length of the antenne in the males, and for the curiously constricted 
abdomen in both sexes (jig. 84. 21.); the veins of the wings are car- 
ried nearly to the base of the wing ( fig. 84. 20.). (See Dalman, 
Anal. Ent.; Klug, in Ehrenberg’s Symb. Physice ; and Griffith, An. 
Kingd., Ins. p\.'76. f. 5.) Psammotherma Lar. is distinguished by the 
strongly bipectinated antennz of the males. Iam indebted to Dr. 
Klug for a species of this genus from southern Africa, and have seen 
a second species in the Berlin Museum. With the exception of a 
species of Pompilus, in the same museum, I know no other Aculeate 
Hymenopterous insect which exhibits this structure. 
The genus Scleroderma Klug, placed by Latreille in this family, 
appears to me to belong to the Proctotrupide, as I have endeavoured 
to prove in a monograph upon the genus, published in the 2d volume 
of the Trans. Entomol. Soc. 
I may here mention another anomalous genus, which I have de- 
scribed under the name of Trigonalys, having somewhat of the aspect 
of a male Mutilla, but with the head flattened and the antenne longer, 
very slender at the tips, and composed of 23 or 24 joints, very like 
those of Lyda; the legs are simple, and the abdomen punctured. 
The veins of the wings are nearly as in Myrmosa and Mutilla Euro- 
peas. Thetype, T. melanoleuca, is from Brazil. 
Latreille also introduces into this family the singular genera Do- 
Pp 4 
