436 Transactions of the Society. 



Genus Acrania g.n. 



Metaparameres intus inflati, extus rotundati, apice recurvi, 

 mucronati, srepius bifidi ; virga simplex, longissima. 



Metaparameres inflated on inner margin, rounded externally, 

 the tips hooked, often bifid ; virga simple, very long. 



Type of the genus, Acrania picta Guer. 



In external structure agrees generally with Kalocrania ; but 

 the metaparameres are neither knobbed nor toothed, but recurved 

 into a sharp hook, which is bifid at the apex in A. picta Gu6r and 

 A. eximia Dohrn, but simple in A. horsfteldi Kirby. 



A further characteristic of the genus is the great length of the 

 virga ; from the extreme base, at the roots of the proparameres, it 

 extends as a simple tube up the entire length of the proparameres, 

 right through the preputial sac, extending, even in repose, far 

 beyond (PI. VII. figs. 5 to 7). 



In A. picta the virga is armed at the base with a long, narrow, 

 curved, acute, chitin plate, and the whole virga is nearly eighteen 

 times as long as the short metaparameres, but is not convoluted. 



In A. eximia the virga is similar, but I can detect no basal 

 armature ; the metaparameres are a little longer and the virga is a 

 little shorter, so that the latter is about six times as long as the 

 former. 



A. horsfieldi is rather different, and will perhaps require a 

 distinct genus ; its narrow ninth sternite of the male and general 

 slender build distinguish it from the sturdy A. picta and A. eximia, 

 and the metaparameres are longer and the hook is entire, not 

 excised at the apex. The virga is about six times as long as the 

 metaparameres, with a slight basal enlargement. 



Sub-family 5. EchinosomatiN/E. 



This is a well-characterized sub-family, pakeotropical in dis- 

 tribution, corresponding to the allied Neotropical Pyragrinse. 



Zacher has called attention to several remarkable features in 

 the genital armature. The metaparameres are long and narrow 

 in the apical portion, and broad and dilated at base, the attenuation 



EXPLANATION OF PLATE VIII 



FIG. 



1. Echinosoma bolivari Rodz. 



2. E. waJilbergi Dohrn. 



3. E.parvulum Dohrn. 



4. E. sumatranum Dohrn. 



5. E. distanti Burr. 

 G. Gonolabidura astruci Burr. 



7. Ditto, ditto. 



8. Allostethella dorix Dubr. 



FIG. 



" 9. Allostethella dorix Dubr. 



10. Allostethus indicum Hagenb. 

 (nymph). 



11. Pyragra fuscata Serv. 



12. P. dohrni Sauss. 



13. Pyragropsis paraguayensis Bor. 



14. P. thoracica Serv. 



