HYMENOPTERA.— EVANIIDZ. 135 
Evania appendigaster* and its immediate allies are parasites upon the 
true Blatte, Mr. Stephens does not regard them as indigenous in- 
habitants. - Mr. Kirby mentions a species existing in a piece of amber 
in his possession (Introd. to Ent. vol. iv. p. 558.). 
The American genera Pelecinus Zatr., and Monomachus Jtlug, 
MSS., are remarkable for the great length of the abdomen in the ¢?, 
which is very slender, and at least six or seven times as long as the 
head and thorax ; the ovipositor is concealed; the males have the ab- 
domen much shorter and clavate. Amongst the genera with the 
ovipositor exserted, may be especially noticed my Australian genus 
Megalyra, having this organ nearly five times as long as the entire 
body ; and the indigenous genus Foenus Fab. (jig. 74. 8. Foenus ja- 
culator, 9—16. details of ditto), which has the abdomen long and 
compressed, and gradually thickened to the extremity ; it is inserted 
on the back of the metathorax (fig. 74. 15. dorsal, and 16. lateral 
view of the thorax); and when the insect is on the wing, it is elevated 
in the air at an angle with the rest of the body, giving, with the 
thickened posterior tibiz, a most singular appearance to the insect. 
In respect to the structure of the thorax, this genus is even more re- 
markable than Evania, for here the mesothoracic scutellum is produced 
into a triangular piece, with two oblique impressions (forming the 
paraptera ?), and extending to the place of insertion of the abdomen 
(fig. 74. 15. 16.), so that the prascutum and scutum of the meta- 
thorax are both apparently (dorsally) obsolete. The clypeus is tri- 
emarginate in front, the upper lip, which is membranous and internal, 
having its extremity alone exposed (fig. 74. 9.). The lip itself is very 
minute, and tongue-like, but the membranous parts to which it is at- 
tached are large (fig. 74. 10.). The mandibles in F. jaculator and F. aus- 
tralis W. are alike, with a very strong internal tooth (fig. 74. 11.12.). 
Curtis describes them as unlike each other in F.assectator. The maxillz 
are short, and terminated by a membranous lobe (fig. 74. 13.), and 
the labium or tongue is narrow, membranous, and elongate (fig. 74. 14.) 
The economy of F. jaculator Linn. was observed by Bergman, who com- 
municated it to Linneus. “Habitat in Apis truncorum, florisomnis 
Sphegisque figuli larvis; antennis perquirit ubi larva latet, avolat, 
redit et imponit ei ovum” (Jn. Suec. 1626); and hence Lehman 
* Illiger cleared up the synonymy of these species in his edition of Rossi Fauna 
Etrusca. His names must, therefore, have the preference over those proposed by 
Curtis. 
K 4 
