lOG GKNEKA OF IIYMKXOl'TKMA. 



4. — Abdomen petiolate. 



First subiiiartriiKil cell not receiving a recurrent nervnre. 



Petiole of abdomen slender, cylindrical, smooth ; fla<;elluni slender at 



apex; intermediate tibiae with two apical spurs SPHECID^. 



Petiole depressed and generally furrowed above; flagellum thickened 

 at apex ; intermediate til)iai with but one apical spur..MIMESID^. 



First submarginal cell receiving a recurrent nervure MELLINID^. 



Abdomen sessile or subsessile, rarely subpetiolate. 



Second snbmarginal cell receiving both recurrent nervures, the first re- 

 current rarely uniting with the first transverse cubital nervure. 

 Marginal cell appendiculate ; mandibles more or less deeply emarginate 

 on their exterior margin (except in Astafa and Liris. which, how- 

 ever, have the marginal cell truncate at apex and the labrum con- 

 cealed) LARRIDuE. 



Marginal cell not appendiculate; mandibles entire on exterior margin. 



Labrum short, not or scarcely exserted NYSSONID^E. 



Labrum distinctly exserted, sometimes rostriform BBMBECIDJE. 



Second and third submargiual cells each receiving a recurrent nervure. 



PHILANTHID2B. 

 .5.— Prothorax long and narrow, produced anteriorly into a neck; metathorax 

 elongate, truncate posteriorly: clypeus carinate, ro.strifurm. 



AMPULICID^. 



Prothorax short, transverse ; metathorax short, rounded posteriorly : clypeus 



not carinate or rostriform PEMPHREDONID^. 



Family MUTILLIDiE. 



Mr. C A. lilake, who iias made tlic study of rlu.< t'Xtcu.-^ivt' tamily 

 a specialty, has publislied in the tliird volume of the.se Transactions 

 (1871), an exhaustive "Synopsis" of the genera and specie.^ found 

 in North America, and subsec^uently a biblio<i-raphicnl catalniiue of 

 the .same. After a space of fifteen years the accunudation of material 

 has made a revision of the family desirable, and which has just been 

 pidilished, l)y the stime author, under the title of " A Monoi>Taph of 

 the ^lutillidie of North America" (Trans. Am. Ent. Soc. xiii, 1S8()). 



The family may be divided into seven genera by the following- 

 characters : 



Table of Genera. 



Marginal cell of anterior wings %, short, the a})ex genenilly truncate and remote 



from the tip of the wing ; 9 i'^'^ '''•" 'i*' known ) without ocelli 2. 



Marginal cell of anterior wings % long and pointed at apex and extending almost 



to the tip of the wing; 9 with distinct ocelli 3. 



2. — Anterior wings without stigma, at least not well develojied: body ojiatiue 



and often densely pilo.se and roughly i)unctured ; 9 without ocelli. 



Antenniu of % flabellate l*Nainiiiof lu'i'iiia l.atr. 



