381. 

 LYDA FASCIATA. 



Order Hymenoptera. Fam. Tenthredinidee. 



Type of the Genus, Tenthredo Sylvatica Linn. 

 Lyda Fab., Sam., King., Le Pelt., Curt. — Pamphilius Lat. — Cepha- 

 leia Jur. — Tenthredo Linn., SfC. 



Antenna: inserted towards the middle of the face, setaceous and 

 simple, but sometimes more robust in the male than female, 

 composed of 25 to 30 joints, basal joint the most robust, 2nd 

 somewhat cupshaped, 3rd not longer than the 1st nearly linear, 

 the remainder insensibly diminishing in size to the end( I the base). 

 Labrum thin, horny and subcordate (2). 



Mandibles long, curved and crossing, acute and rather slender, 

 producing a large tooth on the inside near the middle (3). 

 MaxillcB terminated by 2 lobes the internal one subovate, the 

 external dilated and very pubescent at the apex, the former but 

 slightly so. Palpi very long and pubescent, except at the base, 

 6-jointed, basal joint short, 2nd rather the stoutest, but shorter 

 than the following which are long and nearly of equal length, 

 slightly tapering towards the apex, the 4th and 5th somewhat 

 clavate, the terminal joint subconical at the apex (4). 

 Mentum oblong, horny. Lip rather large, fleshy, slightly hairy 

 and trilobed. Palpi long and stout, pilose and 4-jointed, basal 

 joint the smallest, the remainder nearly of equal length, 2nd sud- 

 denly narrowed at the apex, 3rd the stoutest, subclavate, 4th 

 subovate (5). 

 Mouth concealed by the Clypeus lohich is semicircular. Head large 

 subquadrate or orbicular. Eyes remote, rather small and pro- 

 minent. Ocelli 3 in triangle. Neck short. Thorax subglobose. 

 Wings broad with 2 marginal and 3 complete submarginal cells, the 

 external basal cell small, the intermediate divided at the middle, and 

 the nervure of the internal one venj much sinuated. Abdomen de- 

 pressed, frequently broad, apex rounded. Oviduct not exseried. 

 Tibiae spurred at the apex, 4 posterior with a single spine also on the 

 inside, below the middle. Tarsi 5-jointed. Claws bifd. Pul villi di- 

 stinct (8t hind leg). 



Larvse gregarious, with 6 pectoral, but no membranaceous feet, apex 

 terminated by 2 appendages like horns. Lat. 



Fasciata Curtis's MSS. — Guide, Gen. 474. 



Black and shining, head and thorax coarsely punctured ; base of 

 antennae ochreous 5 mouth, a subcordate spot between the antennae 

 and a minute one behind each eye, yellow ; apex of mandibles 

 ferruginous: scapulars yellow: wings stained yellowish-brown, 

 superior with a darkish brown fascia across the middle ; inferior 

 brownish at the margin ; stigma and nervures piceous : abdomen 

 minutely punctured, black with a violaceous tint ; a yellowish 

 membrane at the margin of the basal joint, the 5th ochreous in 

 the middle, the remainder entirely so, the 3rd and following 

 joints with a yellow spot on the side of each segment, increasing 

 in size towards the apex : legs yellow, base of coxae and of 4 an- 

 terior thighs black ; tarsi orange. 

 In the Cabincti of the British Museum and Mr. Newman. 



