89. 

 ABIA NIGRICORNIS. 



Order Hymenoptera. Fam. Tenthredinidae Lat., Leach. 



Tijpe of the Genus Tenthredo sericea Linii. 

 Abia Leach. Cimbex Fab., Oliv., Lat. Tenthredo Linn., Jur., Panz. 

 Antennce inserted near tlie interior margin of the eyes, short cla- 

 vate, 7-jointed, 1st and 2nd joints transverse, hairy, 3rd very 

 long bent, clavate, 4th and oth more robust clavate- truncate, 

 Cth short robust, 7th short rounded (fig. 1), 

 Labrum transverse, rounded, very pilose (2). 

 Mandibles small, bent, somewhat acute, with a strong tooth on 

 the internal edge, very hairy externally (3). 

 Maxillce small, internal lobe acute, external ovate ciliated. Palpi 

 long coriaceous at the base, membranaceous towards the apex, 

 slightly hairy, 1st and 2nd joints very short, 3rd and 4th of equal 

 length, robust, "jth and Gth longer and more slender (4). 

 Mentum somewhat quadrate, deeply emarginate (5 a). Palpi 

 4 -jointed, 2 first joints coriaceous, the others membranaceous (b). 

 Lip composed of 3 equal lobes, margined (c). 

 Head rather small. Eyes of the males approximating behind. Ocelli 

 3, placed before the eyes, especially in the males. Abdomen sessile, 

 villose, cylindric, broader in the females, the males having a quadrate 

 silky spot beyond the middle. Oviduct not exserted, composed of 2 

 lamellae which are serrated. Superior wings with 2 marginal and 3 

 submarginal cells. Legs slender. Tibiae with obtuse syphonformed 

 spurs. Tarsi with the joints gradually decreasing in length to the 

 last, 5 -jointed, 4 first joints with membranaceous appendages. Claws 

 bifd. Pulvilli distinct (8 afore leg). 

 Larvae with membranaceous feet. 



NiGRicoRNis Leach, Zool. Mis. v. 3. p. 1 13. n. 1 . — nitens Linn. Faun. 

 Suec. 1539. — sericea var. Fab. Syst. Piez. p. 18. n. 10. 

 Male : Antennae black. Eyes dull cinereous. Head and thorax 

 greenish-black. Abdomen dull, brassy green, minutely punc- 

 tured and covered with short pubescence, a large quadrangular 

 blackish spot upon the centre of the 4th, 5th, and 6th segments. 

 Wings iridescent at their margins, stained yellow : superior 

 variegated with brown in the centre and at the apex, nerves pale 

 towards the base, dark at their extremities. Legs pale ochra- 

 ceous, thighs aeneous-black, except at the apex. Female: An- 

 tennae with the club brown. Abdomen dull aureous green, 

 without any spot. 



In the Authofs and other Cabinets. 



