1903.1 



193 



an obtuse witli the brachius), and generally with neither cubital nor 

 medial n. (but sometimes with both ! ) Abd. without large lateral 

 pale markings 



66 (65) Three cubital nn. present : claws with subapieal tooth : areal n. cquidis- 



tiint fronj discoidal n. and 1st medial n Taxonus. 



Only two cubital nn. : claws bifid : areal n. often much nearer to dis- 

 coidal «. than to Ist medial n Emphylus. 



67 (55) Eyes (seen from in front) look shorter and broader, with rather convex 



than concave inner margins. (The extreme length of each = exactly 



half the distance from eye to eye*) Bolerus. 



Eyes (seen as above) look more elongate with just perceptibly concave 

 inner margins. (Their length = two-thirds of the distance between 

 '*^°'"*) Loderus. 



68 (56) Eyes (seen from in front) parallel or but slightly converging— the least dis- 



tance between them clearly greater than the width of the clyp...m. 



Eyes strongly converging— the least distance between them less than the 



width of i\\c clyp h<^ 



69(68) Humeral a. contracted. Ant. long, very slender, and evenly tapering... 



72. 



Humeral a. with short perpendicular n 70. 



70 (69) Ant. long, slender, tapering, with 3rd and 4th joints subequal. Abd. 



without tarsal "blotch " or " nuditas " Tentkredopsis. 



3rd joint of ant. considerably longer than 4th 71. 



71 (70) Ant. short, stout, fusiform (each intermediate joint widening from base to 



apex). The 3rd joint very long as compared with those following. 

 Abdomen broad, its segments above black with narrow whitish-yellow 

 apical margins Sciopteryx. 



Ant. slender and more filiform : the 3rd joint longer than those following, 



but less so than in Sciopteryx. Abdomen more elongate, coloured 

 more or less either with green or with fulvous-red ...Rhogogastera. 



72 (69) Hind-legs abnormally long— when extended the femora reach beyond the 



apex of the abd Pachy protasis. 



Hind-legs of normal length. <? h. lo. with " continuous external neura- 



"*"^ Perineura. 



73 (68) Hind-legs elongate, much as in Pachyprotasis. Humeral a. either shortly 



contracted or with short perpendicular » Macrophya. 



Hind-legs of normal length 74_ 



74 (73) Antenna} sub-fusiform, much as in Sciopteryx. Head (viewed from 



above) with slight projections and incisions in the neighbourhood of 



the ant. (Fig. 6«)* Allantus. 



Antenna} more slender and evenly tapered. Head (viewed from above) 



with strong (angulated) projections and incisions in the neighbourhood 

 of the ant. (Fig. Qh)* Tenthredo. 



* The above are the precise measurements that I find to exist in D. gnnager and L. vcsliijiaHa 

 compared under the microscope (with micrometer, &c.) They are probably approximately 

 correct in other cases. 



* The heiid of AUantr.s {Tcnt/iredo, olim.) waculatus is to some extent transitional between 

 these two forms, but its general structure and faciea make it inseparable from Allantus. 



