94 GENERA OF HYMENOPTERA. 



Nearly 200 species have thus far been described as inhabitiii<r our 

 fauna, about 30 of whicli are said to be identical with Eur()i)ean 

 forms. Since the publication of Mr. Buckley's descriptive pajxTs in 

 1(S()(), onlv a few isolated species have been described as indigenous 

 to our country. 



For exceedinyly intcnstiiiu- accounts of the habits of some of oui- 

 species, we are indebted to the observations of our esteemed friend 

 and cd-lahorfr, the Kev. Dr. H. C. McCook, a list of wliost- publishi'd 

 writings will be given further .on. 



The characters given in the following tables are coni])iled cliietly 

 from the second volume of Andre's admiral)le " Sjjecies des Hymen- 

 opteres d' Europe," published in 1882-b3. 



Family FORMICIDiE. 

 Table of Genera. 



Workers and Females. 



Frontal carina arising more or less near the posterior edge of the clypeus. w liich 

 does not extend back between insertion of antennje; abdomen seen from 

 above shows five segments of which the last is conical and terminal, 

 orifice of anus small, circular, ciliated ; wings 9 with one complete sub- 

 marginal cell 2. 



Frontal carina' arising at the angles or lateral edges of the clypeus. which is tri- 

 angular, usually rounded, extending more or less backward between 

 insertion of antennie: abdomen, viewed from above, shows only the first 

 four segments, the fifth being concealed under the preceding ; anus large, 



transverse, not ciliated ^• 



■>. — Antennae 12-jointed, inserted as near, or even nearer, to middle of frontal 

 carina} than to their anterior extremity, and distant from posterior edge 

 of clypeus; clypeal fovese separated from an ten nal fovea^; ? without 



ocelli •5- 



AntennEeiusertedneartheanteriorextreniity of tin- iVcMita] cariiue ami very 



near the jiosterior edge of clypeus 4. 



3,_('lypeus trapezoidal, the sides diverging more or less anteriorly : frontal 

 carinfE sinuous in form of an 8; head not oblusc or tnnicatc in fnint : 

 .scale of petiole oval, vertical, usually feebly and equally convex on its 



two faces CilililKmoliis Mayr. 



Clypeus with parallel sides, only slightly diverging at anterior angles ; an- 

 terior part of head forming an obtuse angle with the rwuainder of its 

 surface, or even sharply truncate; scale square, thick, <'onvex in front, 

 flat behind and more or less emarginate above <"«lol><>|>si!>» Mayr. 



4.— Manditdcs broad flat, triangular, apical margin dentate •">• 



Mandibles almost cylindrical, curved, very narrow, acute at tip, without 

 apical nuirgin or trace of teeth ; frontal area well defined ; ocelli present ; 

 metathorax gibbous; scale thick, oval, vertical : wings 9 with one dis- 

 coidal cell rolyei'SUS Liitr. 



