206 ICKXEUMONID.E. 



more or less emarginate next the scrobes ; face subprotuberaut 

 and narrower than the frons, a little constricted towards the 

 mouth; cheeks short and not at all buccate; clypeus discrete, 

 convex, apicallv broadly rounded and usually finely margined 

 though not impressed ; mandibles somewhat narrow and gradually 

 dilated basally, with the lower tooth usually somewhat the 

 shorter; maxillary palpi subelongate, with the three apical joints 

 subequal in length. Antennae short or of normal length, slender 

 and filiform, though slightly attenuate apically ; scape nearly 

 entire apically or n. little excised externally at the apex ; basal 

 flagellar joint somewhat elongate, cylindrical, and the apical one 

 conical, sometimes double the length of the penultimate. Thorax 

 gibbulous, longer than high, and narrower than the head ; pleurse 

 smooth and nitidulous ; epomia distinct ; mesonotum ovate, with 

 distinct apical notauli; metathorax with the areas complete, 

 obsolete or wanting ; areola sometimes finely delineated, petiolar 

 area very small and often entire ; spiracles circular and minute. 

 Scutellum subquadrate or subtriangular, apically obtuse and a 

 little convex. Abdomen sessile, or rarely subsessile, as broad as, 

 and twice as long as the thorax, oblong or cylindrical ; epipleura? 

 subobsolete ; basal segment either subquadrate or a little longer 

 than broad, rai-ely basally subconstricted, more or less distinctly 

 bicarinate and transversely impressed before the apex, with the 

 tubercles near the base ; segments two to four or five transversely 

 impressed and tuberculate, with the elevations nitidulous, and 

 more or less punctate : the sixth and seventh of $ with the 

 venter longitudinally cleft ; terebra normally or shortly exserted, 

 never longer than the abdomen and rarely longer than its half ; 

 spicula strongly acuminate, with the valvulae elongately pilose. 

 Legs normal or slender, with the femora somewhat stout ; apical 

 joint of the hind tarsi usually dilated, longer and broader than 

 the penultimate, with the claws stout, and in $ basally lobate ; 

 the hind tibire longer than their femora, with short and subequnl 

 calcaria. Wings normal or ample ; areolet wanting or obsolete, 

 never entire ; radial cell sublanceolate ; first recurrent of lower 

 wings either slightly curved and not intercepted, or distinctly 

 bent and emitting a more or less distinct nervellus. 



Range. Ceylon, Europe, North America, Venezuela. 



The genus was originally distinguished from Pimpla, which it 

 resembles in facies, by the lack of the areolet. Holmgren found, 

 however, that, although it resembled Pimpla in the abdominal 

 conformation, the terebra was as a rule shorter, and the clypeus, 

 besides being more convex, was not, or very rarely deflexed, never 

 impressed, though very often margined before its apex. 



The species of this genus appear to be almost or quite exclu- 

 sively ectoparasites of the Arachnida, and several very interesting 

 and economically important notices have been published respecting 

 their development. In spite of what Eatzeburg and Howard 

 (' Insect Life,' 1888, p. 42) have said to the contrary, we may, 

 I think, assume, that it is invariably the spiders themselves, 



