FOHHOKICS — FAMn,IF>t. 105 



FOSSORES. 



This series, which eon. prises the ditterent families of sand and 

 wood wasjjs, is distinj.Miished from the preeedin^j hy the form of the 

 abdomen, the |)etiole heinj; simpU*, i. e. not formed into seales or 

 nodes, and the sexes consisting of males and females only. The 

 winjjs are never folded and are present in both sexes, except in the 

 females of the Mutillidie which are always apterous. The legs of 

 the females are formed for l)urrowing, and not fitted for collecting 

 pollen, the basal joint of the posterior tarsi being subcylindrical, and 

 not dilatetl, fiattened and densely hairy lus in most of the Bees. 



The families composing this large series may be separated in the 

 following manner : 



Table of Families. 



Protliorax consideraMy i)r()diiw(i postt-riorly, the liiiidcr angles reacliinj; tlie 

 teKulip ; 9 sonit'tinn's apterous, in which case tlie segmcntH uf tlie 



thorax are almost always sohh'red together 2. 



Prothorax usually eoiisisting of little more than a narrow collar, the jjosterior 

 angles often lobately produced, hut never reaching the tegulie ; 9 



never .vpterons ;{. 



2.— Ahdomen with the first ventral segment distinctly seiwrated from the second 

 by a more or less deep constriction or furrow. 

 Intermediate tihias with two apical spurs,* their coxa? contiguous or nearly 



so; 9 apterous MUTILLIDiE. 



Interme<iiate tibite with but one apical spur (except in Myzine 9 ). 'heir 

 coxeei widely separated (less so in Tiphia % and Myzine ■?) ) : 9 



always winged SCOLIID^. 



Ahdomen with the first ventral segment not separated fntni the second by 

 a furrow or constriction of the .joint. 

 Posterior legs short, not reaching to the apex of the abdomen ; eyes 



emarginate within SAPYGID^Sl. 



Posterior legs long, reaching be- md the apex of the abdomen : eyes 



not emarginate within POMPITjID,^. 



3. — Anterior wings with three com])lete subraarginal cells '. 4. 



Anterior wings with two complete submarginal cells 5. 



Anterior wings with but one complete and distinct submarginal cell (in 

 Trypoxylon the second submarginal and third discoidal cells arc 

 indistinctly defined) CBABBONID.^. 



* In the 9 of Myzine in the Scoliidie, the intermediate tibije have apparently 

 two apical spurs, but then the marginal cell is long and narrow, and distinctly 

 separated from the anterior margin of the wing, and the third submarginal cell 

 extends far beyond the ai)ex of the marginal, which is never the case in the 

 Mutillidse. In species with spinose legs it is difficult to distinguish the apical 

 spurs from the spiues, the former, however, are genf^i'ally colored differently from 

 the latter. 



TEAN8. AMEB. ENT. 80C. (14) SUPPL. VOL. 1887. 



