NORTH AMERICAN HYMENOPTERA. 279 



at the lateral posterior margins of the clypeus, rather longer than the 

 thorax ; the clypeus triangular ; the mandibles arcuate ; the thorax 

 elongate, doubly strangulated, rounded at the base and apex ; legs 

 long and slender, the coxte very robust ; femora subclavate ; the 

 tarsi longer than the tibise ; abdomen ovato-conical, attached to the 

 thorax by a short petiole. 



Jflethoca bieolor Say. 



Female. — Body pale yellowish rufous, polished ; head black ; antennae rufous, 

 terminal joints piceous ; mandibles and palpi rufous ; thorax : segments subequal, 

 anterior and posterior ones convex, subovate, intermediate one with two slightly 

 elevated convexities ; abdomen ovate subfusiform ; tergum with a transverse, 

 triangular black spot at the tip of the second segment, another on the third, the 

 remaining ones confluent. Length one-fourth of an inch. (7 mm.) 



Hab. — Indiana. 



The abdomen does not contract abruptly to the petiole, but sub- 

 sides gradually. Van der Linden says that the species of this genus 

 are the females of species of Tengyra. 



Methoca ealifornica Westw. 



Female. — Entirely castaneous, smooth and shining; head convex, flanks of 

 thorax globose; antennse straight, scarcely equal in length to the head and 

 thorax, almost filiform, apical joints blackish ; base of the collar ovate, truncate ; 

 mesonotum narrow, divided into two parts, nearly globose ; abdomen gibbous, 

 .second and following segments clouded at middle with black markings; sting 

 long and slender, with a small lobe on each side ; legs long, unarmed. Length 



9 mm . 



Hab. — California. 



Methoca canadensis Smith. 



Ifa/e.— Black and shining, slightly villose, the face closely punctured, the ver- 

 tex sparingly so ; the anterior margin of the clypeus produced into an elevated 

 tubercle, the tips of the mandibles ferruginous; thorax coarsely punctured, the 

 metathorax coarsely rugose, having above a central channel, which is transversely 

 ridged ; behind, truncate ; the truncation obliquely rugose striate on each side, 

 having a slight central channel ; the legs have the apical joints of the tarsi ob- 

 scurely rufo-piceous, the calcaria ferruginous ; wings hyaline, faintly colored ; 

 abdomen : the basal half of the first segment rugose, the lateral margins elevated 

 and acute ; beyond this the entire abdomen is rather finely and distantly punc- 

 tured, the base of the segments depressed, their margins constricted. Length 



10 mm. 



Hab. — Canada. 



9Iethoca Poeyi Guer. 



3Iale. — Black, without spots, with some whitish hairs ; the metathorax is 

 slightly rugose and truncate ; wings hyaline, the nervures black, the two trans- 

 verso-cubital nervures, which from the second submarginal cell, are not parallel, 



