AMERICAN HYMENOPTERA. 225 



It is possible that the first sis species of Strong t/logaster, of which 

 the males have the under wing without inner cells and the outer cells 

 closed, may be included in this genus, of which only one European 

 species is yet described. 



55. TENTHREDO, Leach. 

 Tenthrcdo, Leach, Zoo.l Misc. 1814. 



Hartig, Die Blattw. 303, Sect. v. 

 (All.),Fam. vi, Klug. Berl. Mag. vii, viii. 



Wings with two marginal and four submarginal cells, the second and 

 third each with a recurrent nervure. Lanceolate cell open at the shoul- 

 der, with a straight cross-line. Bullae as in Allantus. Under wings 

 with two middle cells. 



Antennse 9-jointed, long and slender, generally longer than base of 

 abdomen and testaceous, sometimes shorter and filiform ; joints usually 

 enlarged at tips, second joint not half as long as first, third longer than 

 fourth. 



Head large, as wide as thorax, incurved behind, more extended be- 

 tween eyes and summit than in Mdcrophya ; usually there are two 

 deep channels at sides of ocelli, from antennae to summit, with a cross 

 channel back of ocelli, and a basin from lower ocellus to between the 

 antennae. The nasus is deeply emarginate, produced, and the labrum 

 produced and rather pointed ; mandibles lengthened, pointed, with two 

 or three inner teeth; maxillae with a long horny tooth on the inner 

 side; the second joint of the palpi is sometimes apparently wanting. 



Bodt/ long ; abdomen beyond the middle in f(^males distinctly widened. 



Legs rather long; spurs of tibiaa long and sharp, inner spur of an- 

 terior tibiae obtuse, deeply bifid, often with an obtuse inner division, 

 while that of Macrophya is sharp. 



Table to assist in determining species. 

 A. — Body long: 



AutenusB pale at apex 1. grandis. 



Antennae wholly pale 2. mellinus. 



Aiitennfe pale at base: 



Pleura and pectus rufous 3. xanthus. 



Pleura and jjectus black 4. ruficolor. 



Antennse wholly black or ferruginous: 

 Head above antennse more or less yellow ; 



Abdomen yellow or yellow banded 5. verticalis. 



Abdomen black 6. lobatus. 



Abdomen black above; pleura black 7. angulifer. 



Abdomen black above; an angulate spot on pleura 8. verticalis. 



Abdomen partly rufous: 



Pleura and pectus pale 11. eximius. 



