660. 

 EUCEROS ALBITARSUS. 



Order Hymenoptera. Fam. Ichneumonidac. 



Type of the Genus, Euceros crassicornis Grav. 



EucERos Grav., Curt. 



Antenna inserted near the middle of the face, approximating, as 

 long as the body, porrected, subfusiform, composed of numerous 

 joints, basal joint somewhat chalice-shaped, 2nd short and broad, 

 3rd minute, 4th slender and elongated, 5th and 4 following sub- 

 quadrate, about 10 of the succeeding compressed, dilated inter- 

 nally and forming a fusiform mass, the remainder short and 

 tapering to the apex ( 1 ) . 

 Labrum concealed under the clypeus. 

 Mandibles short, crossing, bifid at the apex. 

 Maxilla not examined. Palpi long slender pubescent and 5- 

 jointed, 2nd joint stout nearly as long as the 3rd ; 4th and 5th 

 rather shorter and slenderer (4). 



Labium not examined. Palpi short and 4-jointed, apical joint 

 small and ovate (5). 

 Head transverse, face broad (1 *), projecting under the antennce (1 f) •• 

 eyes remote, lateral and ovate : ocelli 3 in triangle on the crown of 

 the head. Thorax ovate, gibbose : scutel large, semiorbicular and 

 convex. Abdomen sessile, someivhat elliptical, incurved, depressed, 

 the segments constricted at their junction, 1st joint longest, broad, 

 narrowed at the base (7). Wings, superior without an areolet. 

 Legs slender, anterior the shortest, posterior the longest and stoutest: 

 thighs short: tibiae iiot much longer, spurred : tarsi 5 -jointed, basal 

 joint long : claw's a7id pulvilli minute. 



Albitarsus Curt. Guide, Gen. 522. 37. '2nd Edit. 

 In the Author's Cabinet. 



This remarkable genus is so exceedingly rare that only three 

 specimens of the first species have been discovered, and but 

 one of each of the others, and the females are unknown, which 

 will account for the incomplete description of the trophi, it 

 being quite impossible to obtain a specimen for dissection ; at 

 the same time I could not resist the temptation of giving a 

 figure of the magnificent novelty represented in our plate, 

 as it cannot fail to be acceptable to those who admire and 

 study the interesting order of Hymenoptera. 



