254 BRITISH ICHNEUMONS. {^Exolyius. 



EXOLYTUS, Holmgren. 

 Holnifir. Sv. Ak. Ilandl. 185S, n. 8, p 115; Ofv. 1858, p. 328. 



An elongate and strongly nitidiilous genus Head strongly buccate, 

 often cubical, posteriorly cmarginate and usually broader tlian the eyes; 

 clypeus distinctly discreted and a[)ically broadly rounded ; epistoma pro- 

 minent ; central joints of the labial palpi normal, the aj)ical not unusually 

 elongate. Antennae sub-filiform, rather longer than half the body ; of 9 

 with the joints conical, the third twice longer than broad and the following 

 becoming gradually shorter ; of $ setiform with the joints cylindrical. 

 Thorax strongly nitidulous with mesonotum very convex ; metathorax also 

 convex and apically distinctly produced above the base of the hind coxae ; 

 areae incomplete, the central area conspicuous and transversely wrinkled ; 

 spiracles circular, apophyses wanting. Scutellum convex, apically con- 

 tracted and abruptly declived. Abdomen deplanate in both sexes, 

 pygidium of $ somewhat compressed and acuminate, of $ obtuse, less 

 nitidulous and more strongly pubescent ; basal segment broader than 

 high, straight and rarely deflexed apically, reaching beyond the hind coxae 

 and trochanters, with the spiracles distinctly beyond the centre ; post- 

 petiole sub-quadrate and shortly canaliculate centrally ; segments two and 

 three not compressed, with lateral impressed lines ; terebra very shortly 

 exserted. Legs normal, claws simple ; front tibiae anteriorly pubescent 

 but not spinulose. Areolet pentagonal, with the external nervure obsolete ; 

 nervellus usually antefurcal. 



This genus was, I believe, first mentioned by Forster in the Verb. pr. 

 Rheinl. in 1855, but I have not seen his description, which is probably 

 very bald, with no type, and only Kirchner refers it to him. 



Very little is at present known of the economy of this genus, though 

 both Brischke's record of E. laevigatus from Tenthredinidae and Thomson's 

 of E. tncerii/s, Forst., from Syrphid larvae point to its relation with the 

 Trypho7iinae. 



Table of Species. 



(4). I. Lower wing with median nervure entire basally ; antennae immaculate. 



(3). 2. Head cubical ; frons distinctly punctate ; 



5 flagellum apically attenuate i. laevigatus, 6^n?'(7. 



(2). 3. Head posteriorly rounded ; frons finely punc- 

 tate ; flagellum filiform 2. PETIOLARIS, Thovis. 



(i). 4. Lower wing with median nervure obsolete 

 basally ; antennae basally red. 



(6). 5. Vertex broad ; flagellum normal, of $ basally 



attenuate; coxae red 3. SCRUTATOR, v¥a/. 



(5). 6. Vertex narrow ; flagellum slender and fili- 

 form ; coxae black 4. splendens, tPrrtz/. 



I. laevigatus, Grav. 



Ichneumon laevigatas, Gr. Mem. Ac. Sc. Torin. 1820, p. 371. Mesolepfits laevigatus, 

 Gr. I. E. ii. iii, ef. i. Suppl. 687 ; Ste. 111. M. vii. 230, <? ?. Exolylus laevigatus, 

 Holmgr. Sv. Ak. Ilandl. 1858, n. 8, p. 115, excl. var. i ; Tasch. Zeits. ties. Nal. 1865, 

 p. 10; Fcirst. Verb. Wien. z. -b. Ver. 1876, p. 49, etc. ; Brisch. Schr. Nat. (ies. Danz. 

 1881, p. 179, (5 9- Atractodes laevigatus. Thorns. O. E. x. 1019. A. Dionaeus, Hal. 

 Ann. Nat. Hist. 1839, p. 118; Curt. B. E. 538, S ?. Phygadeuon mesozonius, Gr. I. 

 E. ii. 700, i . P. teneriventris, Gr. lib. cit. 698, et i. Suppl. 707 ; Ste. Ill M. vii. 300 ; 

 Tasch. Zeits. Ges. Nat. 1865, p. 55, i. 



