106 GENERA OF HYMENOITEKA. 



4. — AMomen p<'tii»l»to. 



First HiihiimrKiniil cell nut receiviiiK a recurrent nervure. 



I'ctitilc f»f HlMloiiien Hlonder, ('.vlinilriciil. HiiuM>tli ; fliiKt'll>>>n Hlciider ul 



iipcx ; iutorineilisitc tibiie with two apiciil spiirH SPHECID^. 



Petiole <lcj)r<'«.sc(l and nenenilly fiirrowt'd iilwive ; HuKt'llmii thickened 

 at U|>ex ; intcriuediiite tiliiie with but one apiciil Hpm-..MIMESID^. 



First HnbniiirKiniil cell receivin){ a recurrent nervure MELLINID^. 



Alxlonten sesHile or Huhsetwile, rnrely Hnbpetiolate. 

 8i>cond snbniarKinal cell receiving both recurrent nervurcH, the first re- 

 current rarely unitiuK with the first tninsverse cubital nervure. 

 Marxinal cell apiH-ndiculate; mandibles more or less deeply emarKinate 

 on their exterior niiirgin (except in Ai^tafa and IJriii, which, how- 

 ever, have the marginal cell truncate at a|>ex and the lubnim con- 

 cealed) LARRID^. 



MarKinul cell not append iculate; mandibles entire on exterior margin. 



I.,al>rum short, not or wcarcely exserted NYSSONID^SJ. 



Liibruni distinctly exserted, sometimes rostriform BEMBECID^. 



Second and third submarginal cells each receiving a recurrent nervure. 



PHILANTHID^. 

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

 elongate, truncate posteriorly; clypeus carinate, rostriform. 



AMPULICIDiE. 



Prothorax short, tran.sverse ; metathorax short, rounded posteriorly : clypeus 



not ciirinate or ro.striform PEMPHREDONID^. 



Family MUTILLIDiE. 



Mr. C. A. Blake, who has made the .study of this extensive family 

 a s[)ecialty, ha.s published in the third volume of these Transactions 

 (1871), an exhaustive "Synopsis" of the genera and s{)e('ies found 

 in Nortli America, and subsequently a bibliogra])hical c'atal(>gue of 

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

 has made a revision of tht family desirable, and which ha-s just been 

 published, by the same author, under the title of " A Monograph of 

 the Mutillidie of Xorth America" (Tran.s. Am. Ent. Soc. xiii, 1S86). 



The family nuiy be divided into seven genera by the following 

 characters : 



Table of Genera. 



Marginal cell of anterior wings % short, the apex generally truncate and remote 



from the tip of the wing ; 9 (as far as 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 developed; bo«ly opaque 

 and often densely pilose and roughly punctured ; 9 without ocelli. 

 Antennce of % flabcllate Psammotlierma Latr. ' 



