TRIBE ASPIDIOTINI 429 



dd. Pygidium with second pair of lobes as long as or longer than 

 median pair, subequal in width, similar in shape, lateral 

 notch; median pair of lobes large, conspicuous, close to- 

 gether, mesal and lateral margins nearly parallel, distal mar- 

 gin rounded, slight lateral notch; third pair of lobes about 

 one-half size of second pair, subsimilar in shape; pectinae 

 subequal in length to lobes, arranged 2, 2, 3, 5-6, three caudal 

 pectinae of each lateris deeply lacinate, others simple; dorsal 

 oraceratubae present, promiscuously arranged; usually 

 wanting, sometimes with a single ceroris on each side; anus 

 six times its width from caudal margin and twice its width 



caudad of vulva. Samoan Islands on cocoanut husks 



pangoenensis Doane & Ferris. 



cc. Pygidium with three pectinae on each lateris; median pair of 

 lobes prominent, distinct lateral notch, mesal notch wanting, 

 distal end bluntly rounded; second pair of lobes smaller, irreg- 

 ular, pointed, lateral notch; third pair of lobes small, triangu- 

 lar, pointed; pectinae subequal in length to lobes, arranged 

 2, 2, 3, 3, all except those of median incisura broad, irregu- 

 larly lacinate; each lateris crenulate, bearing two minute 



plates or furcapectinae. Dutch East Africa on Furcraea 



furcraeicolus Lindgr. 

 bb. Pygidium with median pair of lobes entire. 



c. Pygidium with pectinae or plates on each lateris. 

 d. Pygidium with third pair of lobes distinctly smaller than 

 median pair. 



e. Pygidium with median pair of lobes quadrangular, short, 

 much broader than long, entire, truncately rounded; sec- 

 ond pair of lobes minute, as long as broad, entire, bluntly 

 rounded; third pair of lobes minute, sharply pointed, 

 longer than broad; pectinae broad, distinctly longer than 

 median pair of lobes, numerous deep lacinations, arranged 

 2, 2, 3, 4, those of each lateris adjacent to a third lobe, 

 lacinations deeper and teeth much longer than those of 



other pectinae. Abyssinia on Euphorbia fissus Lindgr. 



ee. Pygidium with median pair of lobes large, longer than 

 broad, projecting, parallel, unsymmetrical, entire, distal 

 end broadly rounded; second pair of lobes almost as broad 

 as long, oblique, rounded, margin with several notches; 

 third pair of lobes similar to second, smaller; pectina 

 or plates subequal in length to median pair, dagger- 

 shaped plates or furcapectinae, arranged 2, 2, 3, 3. 



Sardina, Spain on Ephedra. ephedrarum Lindgr. 



dd. Pygidium with three pairs of lobes subequal, similar in 

 shape, entire or finely crenulate, slightly constricted on 

 proximal portion; pectinae subequal in length to lobes, ar- 

 ranged 2, 2, 3, 3, those of incisurae subequal in width, dista- 

 pectinae, those of each lateris toothed lobe-like projections; 

 lateres with several angular or tooth-like projections; setae 

 except cephalic one of each side, subequal in length to lobes, 



