102 Mr. W. D. Lang—Revision of the 
Tabular Diagnoses of the Species. 
A. Avicularia do not replace distal apertural 
spines (7. e., there is no distal shield). 
I. Median area of fusion is imperforate and 
there are no secondary pelmata. 
a. Intraterminal front wall well arched. 
1. Little or no secondary intercecial tissue ; 
avicularia small and blunt. 
a. AVicn AL a ApOLadic, (ye 5). \-15(0 ape 1 
B. Avicularia tend to be arranged 2 2 proxi- 
mally and 2 distally with regard to 
Che aperburo ss tye oeeeciat trays ee 2 
2. A fair amount of secondary interecial 
EISHUO’ nec terntiee ie e ian oie eee 3 
b. Iniratermnnl front wall flat. 
1. Erect, unilaminar. . ais hte cree 
2. Erect, bilaminar. 
wmCost-eabout One ae 
II. Median area of fusion with two rows of 
eae: ; Secondary pelmata present. 
a. A pair of avicularia placed regularly, 
proximally and ese with regard to 
each aperture ........ opstene obs ded eiwtora te 7 
b. Avicularia sporadic. 
1. Coste 12-16; apertures large. 
a. Intraterminal front wall distinctly 
arched. 
avaCostes d2irn as cate tar cet eichh esata) 
Db; CostenlS ci ssawetaae ear nie jonieee 9 
B. Intraterminal front wall fairly flat . 10 
2. Costz more than 16, length nearly Imm. 
a. Less secondary intercecial tissue . . seen als 
8. More secondary intercecial tissue. 
a. Apertures smaller, tending to be 
P. calceata. 
. P. crepidaria. 
. P. solearis. 
. P. interrupta, 
. 5. P. chrysalis. 
Bz. Costz 2oror nore pee ee eee ies 6. 
P. striata. 
. P. @orbignyt. 
. P. pauciclaria. 
. P. quadrata, 
. P. fragilis. 
P. insignis. 
pomted: cor Sine ee neeee eens .. 12. P. suffulta. 
b. Apertures larger, tending to be 
POH Ged pote a salage able ital ee 13. P. fecampensis. 
3. Coste more than 16, length not much 
over 4 mm. 
a. Apertures larger: ...ci0..)cfys 00s aie oliujes 242, Ue. felitonors. 
8. Apertures smaller Sc iite enV ATO betters 15. P. gasterz. 
Tl. Median area of fusion with more than 
two rows of perforations ; secondary and 
tertiary pelmata. 
a. Incrusting; length less than 1 mm. 
Seo ls vn Se sicieabin cn abiatie qa nille 
B. Coste 18-20 : 
b. Erect, unilaminar; length more than 
1 mm.; coste 16- 18 ate ssharelehate tac creestene 18. 
B. Apertural spines are replaced by avicularia 
(z. €., a distal shield more or less present). 
I. Both’ pairs of apertural spines are replaced 
by, AvACwAIIA <5 ann 5 a eee eed 19 
IJ. Distal pair only of apertural spines is re- 
placed by avicularia. 
. P. plantaris. 
. P. simplex, 
P. pero. 
. P. quadrivolucris. 
