HETkKOOYNA — MYRMICID-iE. 103 



Antennse l3-jointed, first joint of funicl" not KloJ>«He, scape elongate 

 clavate ; marginal cell closed at apes; riesotlioiax witli convcrKinjj 



impressed lines ...Nl«*iiannna Westw. 



Marginal cell remarkably short, broadly rounded .i'ii<ally, stigma largf. 



. thick, short; antenna; 1-2-13-jointfd, scape elongate, about as long as 



the tirst three joints of fiinicle united; m'js(jthorax with converging 



impressed lines Leptotliora.i: Mayr. 



7. — Wings dark colored, pilose, ciliated, marginal cell short, obtuse at tip, appen- 

 diculate; antennse 13jointed, first joint of funicle cylindrical ; man- 

 dibles rather narrow, tridentate, concealeil beneath the lahraiu; 

 mesothorax with two converjtcnt grooves; metathorax bidentate. 



.^lyrnieciiia Curtis. 



Wings hyaline, not pilose or ciliated, marginal cell long, pointed at tip ; an- 



tennee l"i-13-jointed, usually attenuate ; mesothorax without convergent 



grooves; metathorax usually unarmed Monoiiioriuili Mayr. 



Note. — Since the above wius in type, the compiler has seen a copy of Dr. Mayr's 

 recent paper, entitled " Die Forniiciden dcr Vereinigten Staaten von Nordamerika 

 (Verb, zool.-bot. Ges. Wien, Dec. 1.S86), in which the following genera, not char- 

 acterized in the foregoing tables, are mentioned as occurring in our fauna. 



Dr. Mayr appears also to have confirmed his former opinion that Labidusis the 

 % of Eciton. 



Iridoinyrinex Mayr. — ^ . Head, together with the mandibles, triangular, 

 being narrowed toward the cheeks; mandibles very broad, the apical (or biting) 

 margin only slightly shorter than the exterior margin, more or less distiTictly 

 toothed ; maxillary palpi 6 jointed, short ; middle lobe of labrum broadly trian- 

 gular, deeply emarginate medially, lateral lolies pointed ; clypeus triangular, the 

 posterior angles strongly rounded, not carinate, only moderately convex ; clypeal 

 fovese uniting with the antennal fovese ; frontal carina arising at the lateral mar- 

 gin of the clypeus near to the posterior end, and extending straight and parallel 

 backward, ending in the elevation between the eyes; antennai 12-jointed, in- 

 serted on the anterior margin of the frontal carina; at the edge of the clypeus, 

 the scape tolerably long, extending beyond the posterior mai-gin of the head, 

 flagellum nearly setaceous, only feebly thicker at apex than at base, the first 

 joint longe.st, the next following until the penultimate gradually longer, the 

 spindle-shaped apiciil joint also longer; frontal area triangular, somewhat longer 

 than broad and very indistinct; frontal groove alway.s indistinct; ocelli ab.sent : 

 eyes tolerably small, oval, placed almost in the middle of the upper side of the 

 head, between the cheeks and the hind angles ; occiput emarginate posteriorly : 

 prothorax above hemispherically convex, sloping gradually to the me.sothorax at 

 the end of which it is most deeply impressed ; metathorax abrui);ly elevated, 

 strongly gibbous, slightly longer than broad ; abdomen moderately small, the 

 petiole with an erect, tolerably short and thick scale ; {wsterior femora somewhat 

 longer than their tibire. spui-s pectinate, claws simple. 



This genus seems closelv r.llied to the next, differing chiefly in the 

 form of the antennie and in the absence of the ocelli. 



