AMERICAN HYMENOPTERA. 121 



5. J lead aud thorax black <i. 



Head black ; prothorax. legs and abdomen, except apex, yellowish or ferru- 

 ginous 9. geiitilis Cress. 



6. Black, with segments 2 and 3 of abdomen yellowish Ottowaen*i». 



Head, thorax and abdomen above black 28. insolitu* How. 



Head and thorax dull black, abdomen wholly rufous. . . .21. siii<-ariic How. 



IVzomachus Birkiiiani sp. nov. 



Female. — Length 3.5 mm. — Slender, yellowish ferruginous, except a piceous 

 spot at the base of the abdominal petiole, narrow piceous band at base of third 

 abdominal segment, black tips of mandibles and infuscated apical joints of an- 

 tennae. Antennae stout, 19-jointed, somewhat thickened toward the apex, almost 

 as long as the body, their joints shorter than usual, tlie eighth flagellar joint being 

 no longer than wide. The joints annulate with black from third joint, the rings 

 becoming wider and the joints wider apically. Ocelli equidistant, the posterior 

 ones about equidistant from one another and the eyes, each ocellus surrounded 

 by a very small elongate black spot. Thorax more sharply constricted than usual 

 between meso- and metathorax. Mesonotum not impressed, its lateral dentiform 

 processes distinct, the dorsum evenly but not very convex and much longer than 

 the metathorax. Metathorax rather sharply declivous behind, more sharply con- 

 vex anteriorly, its posterior face very finely rugose, separated from the dorsum 

 by a fine raised line which is interrupted medially. Abdominal petiole rather 

 long, its lateral teeth large and distinct. Abdomen more shining than the head 

 and thorax, ovate, first and second segments yellow ferruginous; a piceous band 

 at the base of the third ; following segments darker. Legs yellowish ferruginous. 

 Ovipositor about one aud one-half times as long as the abdominal pedicel. 



A female specimen collected at Fedor, Lee County, Texas, by 

 Rev. G. Birkman, on April 1, 1901. 



This species comes near to alternatus Cress., and like it has the 

 antennal joints unusually short. It differs from the latter in having 

 a long ovipositor which extends beyond the tip of the abdomen for 

 a distance considerably greater than the length of the petiole of the 

 abdomen. 



I'czomaelms maculi<-olli* sp. nov. 



Female. — Length 2.5 mm. Black, with ferruginous markings. Head black, 

 not shining; face below antenna? ferruginous except for a longitudinal stripe 

 below each antennae. Mandibles reddish black at the bidentate tips. Palpi fus- 

 cous. Antennae pale ferruginous, with dark incisures at the joints and blackened 

 on apical fourth, 19-jointed. Cheeks fuscous below. Thorax black, not shining ; 

 collar rufous on the sides, mesonotum with a ferruginous V-shaped spot pointing 

 anteriorly, a small ferruginous spot each side of the apex of the V. Metathorax 

 with two ferruginous dorsal spots. Posterior lobe of the thorax much more 

 strongly and sharply convex than the anterior lobe and about as long. Posterior 

 face of metathorax bordered by a sharp carina, finely rugose; thorax elsewhere 

 delicately punctate. Scutellum absent. Abdomen piceous black, subclavate; first 

 segment rather short and broad and gradually dilated posteriorly ; piceous-brown 



TRANS. AM. ENT. SOC XXIX. (16) MARCH. 1903. 



