73. 

 BASSUS CALCULATOR. 



Order Hymenoptera. Fam. Ichneumonidae Lat., Leach. 



Type of the Genus B. Calculator Fab. 

 Bassus Fah. Ichneumon Fab., Lot., Jur., Panz. 



AntenncE setaceous, more slender in the males than in the fe- 

 males, inserted towards the top of the face, distant, many-jointed, 

 1st joint robust curved, 2nd small turbinate, 3rd longer than the 

 1st, the following decreasing in length to the apex, covered with 

 short coarse hairs (fig. 1). 



Labrum transverse, slightly narrowed before, with a triangular, 

 membranaceous, hairy tongue, projecting from beneath (2). 

 Mandibles very thin coriaceous, small, somewhat elongated, 

 acute, bifid, hairy externally (3). 



MaxillcE membranaceous, internal lobe covered with short hair 

 at the extremity, external lobe rounded, ciliated : Palpi pilose, 

 composed of 5 long joints, 2 first joints robust, 3rd the longest, 

 4th and 5th slender (4). 



Mentum nearly quadrate-elongate (5 a) : Palpi hairy, 4-jointed, 



2 first joints more robust than the two following (b) : Labium 



nearly cylindric entire, divided down the middle above (c). 



Head transverse, as broad as the thorax. Ocelli 3. Thorax ovate, 



elevated, long, somewhat attenuated anteriorly. Abdomen scarcely 



petiolated, not longer than the head and thorax, oblong, somewhat 



depressed, shining, composed of few joints in the males ; more cylin- 



- dric, somewhat arcuated in the females {&) . Oviduct exserted, as 



long as the body. Wings alike in both sexes, superior with one 



narrow oblique marginal cell ; submarginal cells 3, \st incomplete, 



2nd very minute, 3rd very targe, discoidal cells 2, of nearly equal 



size, inferior 07ie incomplete ; stigma large; inferior wings small linear. 



Legs ; anterior small, posterior long robust. Tibiae spurred. Tarsi 



5-jointed, basal joint very long, 4tfi minute. Claws small simple 



(8 afore leg). 



Calculator Fab. Ent. Syst. suppl. p. 225. n. 131. Syst. Piez. p. 98. 

 n. 21. Calculatorius Panz. Faun. Germ. 83. tab. \3.fem. 

 Black, shining. Thorax, scutellum, 4 anterior legs and trophi 

 brick-colour : metathorax deeply punctured ; basal and 2nd 

 segments of abdomen deeply and longitudinally channelled: 

 apex of posterior thighs ferruginous, base of posterior tibiiE dirty 

 white. Wings very pale-fuscous, iridescent : stigma and nerves 

 brown : anterior coxae in the male, brick -colour. 

 In the Cabinet of the Author. 



