348 BULLETIN 15, UNITED STATES NATIONAL MUSEUM. - 



Miii'giiiiil vi'iu lit least twice as long as tlm first abscissa of radius, the lat- 

 ter straight, in a right angle with the costa or only slightly oblique. 



Zelotypa Forst. 

 Marginal cell open, or wanting. 

 Marginal cell wanting. 



Basal vein distinct; antennae filiform, pnbeacent, the first flagellar joint 

 twice as long as the pedicel, slightly eniarginate at base. 



Pantolyta Fiirst. 

 Marginal cell more or leas distinctly iiresent. 



Marginal cell much lengthened; marginal vein hardly longer than the 



• ■ first abscissa of radius; antennte filiform pubescent, all the joints 



lengthened, the first flagellar joint emargiuate at base; anterior 



tibia* strongly bent, outwardly produced towards one side into a 



tooth or spine i.. ...... Zygota Forst. 



Marginal cell not nmch lengthened; first abscissa of radius very oblique; 

 an*;erior tibiic simple; antenna-, thick, filiform, densely pubescent, 

 the first flagellar joint not longer than the second, emarginate at base. 



AcLiSTA Forst. 

 4. Mesonotum with two furrows; marginal cell long, open. 



Antenna-, stout, filiform, the first flagellar joint longer than the second, the 

 second slightly emarginate at base, the joints after second scarcely 



twice .ip long as thick Psii.OMJfA Forst. 



Mesonotum without furrows. 

 Antenna; filiform, the first flagellar joint shorter than the second. .Ismauus HaL 



MACROHYNNIS Forster. 

 Hym, Stud., ii, p. 131 (1856). 



A geuus unknown to me, and tlie type, if still in existence, has never 

 been described. Dr. Forster in speaking of it says : 



In the genus Maei-ohi/nnis we have befoKi us, on account of its peculiar venation, 

 a very striking form which can scarcely be confounded with any other. 



The marginal nervure, for instance, is fully twice as long as the rather short 

 marginal cell, and both combined present exactly the appearance of a plow-share of 

 simple construction ; while the backward directed bi'anch of the radius, if continued 

 would cross the basal nervure. 



All joints in the female aiiteuuic are ehmgate, cylindrical, and so strongly length- 

 ened as to be readily confounded with those of the male were it not for the excision 

 of the first flagellar joint and the pointed abdomen, which betray its sex. The 

 scape is short in both sexes; in the female at the most as long as the first joint of 

 the flagellnm, while in the male it is usually somewhat shorter. The lateral angles 

 of the metanotum are slightly projecting. The abdominal petiole is longer than the 

 metanotum, although not abnormally long, and slightly furrowed above. The second 

 segment of the abdomen which viewed laterally appears to be slightly compressed, 

 together with the remaining segments, have a pear-shaped appearance i>articularly 

 pronounced in the case of the female, while in I he male the tip of the abdomen ia 

 curved downward, giving the apex rather a more l iunt appearance. The sutures 

 between the segments are very fine and the segments themselves are strongly 

 shortened, so that they are almost transversely linear. 



.^ DIPHORA Forster. 



•^- Hym. Stud., II, p. 130 (1856). 



(Type I>. Wi'stwoodii Forster.) 



This genus is likewise unknown to me. Dr. Forster, op. cit., p. 141, 

 mentions as the tyiJe, Diphora Weatwoodiiy but gives no descriptiou 



