AMERICAN HYMENOPTERA. 247 



MYRMOSA Latr. 

 Tinicolor Say; Blake, Trans. Am. Eat. Soc. iii, 265. Pennsylvania, Missouri, 

 rufiventris Blake, ibid. vii, 254, 'J, . Colorado. 



METHOCA Latr. 

 stygia Say, (Tengyra), Boat. Jour, i, 299, '^ . Canada, Lidiana, Colorado. 



canadensii Sm. Brit. Mus. Cat. iii, 67, % . 

 Poeyi Guer. Icon. Eeg. Anim. Ins. 430, % 9- Cuba. 



Descriptions of New Species. 



ITIutilla quadrideus.— 9 . — Black, head quadrate, double the width of 

 thorax, posterior angles acute, face densely rugose, vertex clothed with pale 

 golden pubescence, cheeks prominent, deeply punctured, bearing beneath two 

 strong spines, curved forward, in front of these, behind the mandibles, are two 

 shorter ones, head below clothed with long glittering hairs; mandibles black, 

 polished, stout, with two teeth before the apex; autennse black, scape clothed 

 with long pale golden puljescence, flagellum dark ferruginous in front; eyes 

 moderately prominent, ovate; thorax subquadrate, slightly constricted, rugose, 

 prothorax with a stout tubercle on each side posteriorly, disc of mesothorax 

 clothed with pale golden pubescence; metathorax roundly truncate, flanks 

 polished, very thinly sericeous; legs black, polisheW, clothed with long glitter- 

 ing hairs, the intermediate and posterior tibiae armed exteriorly with a row of 

 spines, calcaria long, black; abdomen ovate, basal segment nodose, second 

 segment having an ovate spot of deep golden pubescence on the disc, apical 

 margins of segments thinly fringed with long pale hairs; under side shining, 

 punctured, thinly clothed with pale glittering hairs. Length 19 mm. 



Hah. — Panama, (H. Strecker). This species is allied to Rohinsonii 

 and cajntafa, but is readily distinguished from the former by the 

 ovate spot on second abdominal segment, and from the latter by the 



size of the head. 

 » 

 Iflutilla ITIarpesia. — 9- — Black, head subquadrate, rounded posteriorly, 

 clothed with yellow pubescence, cheeks coarsely punctured, mouth densely 

 cloth'ed with pale pubescence; antennae fuscous, scape clothed with whitish 

 pubescence, flagellum slightly pruinose; eyes round, polished; thorax ovate 

 densely covered with yellow pubescence; legs black, thinly clothed with long 

 silvery hairs, spines of tibiae and tarsi fuscous; abdomen ovate, apical margin 

 of basal segment fringed with pale pubescence, basal half of second segment 

 black, closely punctured, clothed with erect black hairs, apical margin and 

 remaining segments clotlied with yellow pubescence; ventral segments black, 

 deeply punctured; entire insect beneath, thinly clothed with long silvery 

 hairs, more dense on apical margins. Length 10 — 12 mm. 

 Hab. — Kansas, Utah, (Snow.) 



9IutilEa ochracea. — %. — Black; head, thorax and abdomen, with ex- 

 ception of the first, and basal half of second segments, clothed with long, 

 erect ochraceous pubescence; head round, closely punctured, eyes prominent, 

 round, jiolished ; antennae black, scape finely punctured; thorax robust, ovate, 

 metathorax abruptly truncate, coarsely reticulate, flanks coarsely punctured ; 



