SUBFAMILY II. — MEZIRIN^E. 321 



species are known, four from South and Central America, the 

 other occurring in our territory. 



253 (403). Nannium pusio Heidemann, 1909a, 189. 



Oblong. Pale reddish-brown, nearly uniform; tips of antennal joints 

 and of femora and tibia? narrowly paler. Head as long as broad ; tylus 

 very short, scarcely reaching middle of first antennal; impressions of ver- 

 tex oval, deep; antenniferous spines short, triangular, divergent; an- 

 tennae with first joint strongly curved, its apical half much enlarged, 

 second and fourth subequal, each about one-half the length of third. Pro- 

 notum deeply emarginate near middle, its margins very finely dentate, 

 front portion of disk with four short carinse or tubercles. Scutellum 

 broadly triangular, disk with a median lengthwise carina, each side of 

 which is a small triangular space with raised margins. Male with sides 

 of abdomen parallel, middle of ventral segments subequal in length, geni- 

 tal segment very short, convex, its lobes narrow. Length 3 — 3.6 mm. 



Cincinnati, Ohio, Oct. 2 (Davis). Described from there and 

 not known elsewhere. Taken by sifting earth near an old de- 

 caying tree stump. 



V. MEZIRA Amyot & Serville, 1843, 305. 



Species of medium size and oval form having the head as 

 long as or longer than broad ; tylus stout, not surpassing apex 

 of first antennal, its sides embraced by the cheeks, which are 

 contiguous in front of it ; antenniferous spines short, broad, 

 triangular, divergent; impressions of vertex broad, shallow; 

 antennae shorter than head and pronotum united, first joint 

 slender at base, much enlarged beyond middle, third one, in 

 our species (subgenus A rictus) distinctly longer than second; 

 beak reaching base of head, its groove wide, shallow, with sides 

 parallel; pronotum with sides more or less sinuate or emar- 

 ginate, disk coarsely granulate, its front portion with four 

 carinas or obtuse elevations ; scutellum broadly subtriangular, 

 its apex narrowly rounded, disk usually with an evident length- 

 wise median carina ; corium but little longer than scutellum ; 

 ventrals without a keel between spiracles and side margins, but 

 usually with a distinct ridge lying just within the spiracles. 

 Male with fifth ventral much narrowed at middle, sixth longest 

 at middle, seventh visible, very short, its lobes narrow, sub- 

 spatulate ; genital segment short, very convex. Our members 

 of this genus were formerly included under the name Brachy- 

 rhynchus Lap., which Bergroth (1906, 202) showed was preoc- 

 cupied. The genus is a large one, 20 species, mostly from the 

 tropical regions being recognized by Stal (1873, 143), and 14 



