lO BRITISH ICHNEUMONS. 



Trentep. Isis, 1826, p. 297. Batickus vettator, Illig. Rossi F. E. , No. 767. Ttv^us 

 caertileator, Panz. F. G., pi. c, t. 13 ; Revis. 80 T. /apit/alor, Gr. I. K. ii. 391 ; 

 Wesni. Bui. Ac. Briix. 1854, p. 135, 6- PsHomastix lapidator, Tisch. .Stett. Zeit. 

 1868, 6 9 ', cf. Krisch. Ent. Nachr. 1882, p. 173. Dinotomus lapidator. Berth. Ann. 

 Soc. Fr. 1896, p. 296 ; Mori. E.M.M. 1901, p. 249, {, 9 . Var. Trogiis fiiscipeniiis, Gr. 

 I. E. ii. 389, ¥• 



Head black, transverse ; eyes prominent ; face entirely black, somewhat 

 protuberant longitudinally in the centre, strongly and evenly punctate ; 

 clypeus black, apically emarginate, slightly raised laterally, strongly punc- 

 tate, with scanty white hairs ; mandibles black, rufescent apically, punctate 

 and margined, very obsoletely bifid and much depressed apically ; labrum, 

 ligula, maxillary and labial palpi fulvous \ second joint of maxillary palpi 

 strongly lobed, apical long and cylindrical ; labial palpi with joints some- 

 what moniliform. Antennae rather short, entirely black above, flagellum 

 ferrugineous below towards the base ; darker, with joints more cylindrical 

 in 9 . Thorax black ; mesonotum finely, evenly and distinctly punctured, 

 with an anterior central depression in ? \ mesopleurae finely scabrous, 

 inter-sternal sulcus smooth and narrow ; metathorax strongly punctate, 

 with black pilosity ; areola very short, triangular, the posterior area only 

 well defined. Scutellum black, strongly punctate, with dark pilosity, 

 tumidulous, apically acuminate. Abdomen violaceous- or caeruleous-black, 

 longitudinally rugose, the sculpture much coarser in ? , incisures deeply 

 impressed, dorsum of central segments depressed ; petiole bicarinate, 

 much explanate apically with the central area narrow, aciculate in $, 

 rugose in ? ; gastrocaeli normal, deeply impressed ; two apical segments 

 small and inconspicuous ; $ with ventral fold on segments 2-5, $ on 2-3 ; 

 terebra scarcely visible, and barely exserted beyond apex of the hypopygium. 

 Legs fulvous, coxae and trochanters, except apex of hind pair, black ; hind 

 tarsi more or less nigrescent, onychii red. Wings somewhat infuscate ; 

 costa and tegulae piceous, radix ferrugineous ; basal nervures piceous, the 

 apical and the stigma ferrugineous ; areolet distinctly sub-petiolate, its 

 sides converging above. Length, 13-18 mm. 



The \diX. fuscipefinis has the wings very dark, with a violet reflection. 



This species is a well known parasite of Papilio Macliaon. It is solitary 

 in its parasitism, and the imago emerges from the host's pupa through a 

 large irregularly circular hole, often in the right wing-case. All the British 

 examples have been bred from the above host. 



There is a $ in Rev. T. A. Marshall's collection (Mus. Mason) labelled 

 "British, 1893," and others in those of Messrs. A. Beaumont and W. W. 

 Esam. The latter received twelve larvae, of which only three pupated, 

 two of these producing the sexes of D. lapidator {p^o^o. described). There 

 is little doubt these also are British, since they were obtained from a 

 collector in the Cambridge Fens, in June, through Edmonds, who had no 

 foreign Machaon till the autumn. Mr. Janson has also bred it from P. 

 Machaoti, but is by no means sure that the host was British. 



On the Continent it is very rare in Sweden, where Holmgren never 

 met with it, and uncommon in central and southern Europe, extending 

 to Algeria. It has been bred from A/\s;y}ifiis Pandora, by Mocsary. 

 Gravenhorst says, " Habitat in floribus, in dumetis, in regionibus sylva- 

 ticis," and M. Pic has recently taken it at Digoin, on umbelliferous flowers, 

 in August. 



