692. 

 TENTHREDO CINGULATA. 



Order Hymenoptera. Fam. Tenthredinidae. 



Type of the Genus, Tenthredo dimidiata Fab. 



Tenthredo Linn., Curt. — Hylotoma Fab. — Allantus Jur. 



Antenna stoutest in the male, inserted near the middle of the 

 face, approximating, shorter than the body, compressed, slightly 

 pubescent and 9-jointed (1) ; basal joint the stoutest and ob- 

 ovate, 2nd the smallest, cup-shaped, 3rd as long as the 4th, the 

 remainder decreasing in length, the apical joint short and ellip- 

 tical in the male. 



Labrum inserted under the clypeus, orbicular, slightly truncated 

 at the base, the margin ciliated with longish hairs (2). 

 Mandibles very similar, elongate, linear, convex and hairy ex- 

 ternally, the apex forming a large claw, with a small tooth be- 

 low and a tubercle at the middle (3). 



Maxillce slender, terminated by an ovate lobe, with an internal 

 one equally large, and very pubescent, the apex acuminated. 

 Palpi long pubescent and 6-jointed, basal joint short, 2nd and 

 3rd the stoutest, the former scarcely so long as the 3rd or 4th; 

 5th and 6th a little shorter, the last slightly clavate (4). 

 Mentum corset-shaped. Palpi attached to the anterior angles, 

 rather long, hairy and 4-jointed, basal joint obovate, 2nd twice 

 as long, curved and ciliated before, 3rd and 4th much broader, 

 especially the former which is ovate, the latter ovate-conic. Lip 

 rather large and cordate, composed of 3 lobes, the outer ones 

 ovate-trigonate, the central one narrow, dilated at the apex (5). 

 Males generally smaller than the females. Head transverse, base con- 

 cave-, face trigonate : eyes, lateral prominent and ovate: ocelli /«r^e, 

 3 in triangle on the croivn. Thorax not large, subglobose : scutel 

 rather large and semiovate. Abdomen linear and depressed in the 

 males, rather large and convex in the females, the upex conical : ovi- 

 positor with the apex projecting. Wings, superior with 2 marginal 

 and 4 submarginal cells. Legs, anterior the shortest, hinder the 

 longest: coxae, hinder large: thighs short, hinder the stoutest: tih\3s 

 all armed at the apex loith a pair of spurs : tarsi 5 -jointed, first 4 

 joints lobed beneath : claws bifid : pulvilli distinct. 

 Larvae with 6 pectoral, 1 4 abdominal and 2 anal feet. 



CiNGULATA Fab. — Curt. Guide, Gen. 467. 2. 



Male black : abdomen and legs bright ochre, excepting the back 

 of the 2 basal segments and the coxa and trochanters : head and 

 scutel strongly punctured : wings yellowish fuscous, scapulars 

 and costa ochreous, nervures and stigma brown, the latter with 

 an ochreous margin. Female with 2 basal joints of antennae 

 bright ochre : abdomen brow^n, margins of segments ochreous, 

 excepting the basal one ; in other respects it is like the male. 

 In the Author s Cabinet. 



