TRIBE ASPIDIOTINI 417 



f. Pygidium with second and fourth pairs of paraphyses 



subequal in length. 



g. Pygidium with fourth and sixth pairs of paraphyses 

 subequal, second, fourth, and sixth pairs longest, 

 others shorter and smaller; lobes broad, low, incon- 

 spicuous, median pair twice as broad as long; second 

 pair of lobes about or nearly as broad as first; third 

 pair of lobes obsolete; plates scarcely visible, third 

 incisurae with two; each lateris with depression with 

 pair of spine-like plates, cephalad of this minutely 

 serrate with three distant pointed prominences; gena- 



cerores (8-8)4-7. Mexico reniformis Ckll. 



gg- Pygidium with fourth pair of paraphyses longer than 

 sixth, fourth and fifth pairs subequal, second pair as 

 long as fourth, longer than first and third, fourth 

 pair very slightly longer than subequal second and 

 fifth, first and third pairs subequal and slightly shorter 

 than sixth; median pair of lobes elongate, longer than 

 broad, distinct lateral and mesal notches; second pair 

 of lobes similar in size and shape to median, distinct 

 lateral notch; third pair of lobes broad, bluntly 

 pointed, lateral margin with two or three notches; 

 pectinae deeply lacinate, arranged 2, 2, 3, 3, those of 

 incisurae other than median and of each lateris 

 unapectinae and longer than lobes; lateres with large 

 tooth-like projection adjacent to pectinae; genacerores 



(4-5)1-2. Australia on Acacia. fodiens Mask. 



ff. Pygidium with second and fourth pairs of paraphyses 



not subequal in length. 



g. Pygidium with fourth pair of paraphyses longer than 

 sixth, fourth pair longest, second and sixth pairs 

 subequal and two-thirds length of fourth, first and 

 third pairs distinctly shorter than second; median 

 pair of lobes quadrangular, broader than long, entire, 

 truncate with rounded angles; second and third pairs 

 of lobes shorter than median and more than twice as 

 broad, entire, distal margins oblique; pectinae about 

 as long as median lobes or shorter, arranged 2, 2, 3, 

 3; lateres with two slight indentations; metathorax 

 with large blunt marginal tubercle, tubercles and 

 margins of abdomen strongly chitinized; anus near 

 middle of pygidium and vulva near middle of cephalic 

 half; genacerores (6-8)5-6. British Guiana on 

 Lecythis. umboniferus Newst. 



gg. Pygidium with fourth pair of paraphyses distinctly 

 shorter than sixth. 



h. Pygidium with fifth pair of paraphyses longer than 

 sixth, second and fifth pairs longer than others, 

 first and third pairs subequal, slightly more than 

 one-half length of second, longer than sixth, sixth 



