328 THE coccroAE 



Pygidium with brevaceratubae of first and sec- 

 ond rows wanting, those of third and fourth 

 rows numerous; median pair of lobes elongate, 

 tapering, bluntly pointed, serrate; second pair 

 of lobes incised, mesal lobelet elongate, more 

 than twice as long as lateral, lateral margin 

 oblique, serrate, lateral lobelet bluntly round- 

 ed; third pair of lobes rudimentary, incised, 

 lobelets broader than long, lateral margins 

 oblique, serrate; plates stout, arranged 0, 1, 1, 

 5-6, those of each lateris arranged l-l-3or4; 

 anus located slightly cephalad of vulva; gena- 



cerores 4-10(12-21)8-14.— Ohio on Gleditsia 



gleditsiae Saunders. 

 Pygidium with brevaceratubae of first or second 

 rows or both rows present. 



j. Pygidium with median pair of lobes with 

 distal portion bluntly pointed or obscurely 

 trilobed, faintly serrate; second and third 

 pairs of lobes incised, mesal lobelet much 

 larger than lateral, bluntly rounded, faintly 

 serrate; plates long, slender, arranged 0, 1, 

 1-2, 9-14, those of each lateris arranged 2-1 

 or3-6or9, usually with one plate in each 

 third incisura and two on lateris adjacent 

 each third lobe; brevaceratubae 3-6 in mesal 

 group of second row, 4-6 in mesal group and 

 5-7 in lateral group of third row, 6-8 in mesal 

 group and 8-10 in lateral group of fourth row; 

 anus located cephalad of vulva; genacerores 

 11-19(25-42)19-28. — Canada. Massachusetts. 

 New York on Alnus. Salix, Viburnum, Cornus, 



Benzoin, Amelanchier, Betula, Dirca, etc 



lintneri Comst. 



jj- Pygidium with median pair of lobes with dis- 

 tal portion broadly bluntly rounded. 



k. Pygidium with brevaceratubae with mesal 

 group of second row 7, third row in two 

 groups, 9 lateral and 7 mesal, fourth row 

 in three groups, 13 lateral, 4 median and 

 3 mesal, fifth row in two groups, 11 lat- 

 eral and 5 mesal; median pair of lobes 

 prominent, sides subparallel, distal ends 

 bluntly rounded; second pair of lobes in- 

 cised, mesal lobelet longer and broader 

 than lateral, less than one-half width of 

 median lobe; third pair of lobes incised, 

 mesal lobelet distinct, lateral lobelet small, 

 obscure; plates slightly longer than median 

 pair of lobes, arranged 0, 1, 2, 9-10, those 



