660 Mil. B. F. CUMMINGS ON LICE 



short ejaculatory dnct, the large testes, and the curious Jocular 

 character of the vesicula seviinalis, which, as usual, consists of a 

 light and a left ventricle fused into an orgaji of the shape seen in 

 the text-figure. 



The Philopteri of Stokks and Ibises. 



Two new genera are diagnosed below — the one represented by 

 Philopterus tricolor N. and found upon the Ciconiidas, and the 

 other represented by P. plataleoi D. and found upon the Ibididfe. 

 These two genei-a stand fairly close to one another. Ibidoecus, 

 gen. nov., contains the species designated " Bisignati " by Piaget 

 and characterised by the large double signature ; Neo2:)hilo'pterus, 

 gen. nov., contains the forms which Piaget collected under the 

 heading " Setosi," and is characterised by the fusion of the 

 double signature into one plate. Other well-defined characters 

 are recounted under the respective diagnoses of these two 

 genera. 



Neophilopteiius, gen. nov. 



Head, especially in the female, relatively small ; on the dorsal 

 surface of the pre-anfcennal area, a transvei'se suture marks the 

 posterior margin of the signature. In the new genus Ihidceciis 

 each element of the double signature ends behind in an acute 

 angle. In the present genus two acute angles are present poste- 

 riorly, suggesting fusion of an originally double plate *. Each of 

 these posterior angles is situated more laterally than in Ibidcecus, 

 and the plate on each side extends further, so as to overlie the 

 clypeal band so piominent in Ibid-oems. By focussing down, 

 the clypeal band is seen crossing the suture and thus uniting the 

 clypeal region with the skull (as in other Philopteri). Thorax 

 longer than broad, with a strong, transverse, acetabular bar 

 running in fi'om each side between the first and second paiis 

 of legs and giving attachment to the former. Clavicles present. 

 Abdomen with two transverse rows of silky hairs on the tergura 

 of each segment. Two tergites on each segment situated late- 

 rally and leaving a. bare median field except in the terminal seg- 

 ment, where the}^ meet across the middle. The male copulatorv 

 apparatus is also fairly characteristic, and may probably prove 

 diagnostic for the whole genus. 



Genotype : JV. tricolor Nitzsch (5, p. 96). 



Parasites of the Ciconiidae. 



The following good species can with certainty be referred to 

 this genus : — jV. tricolor N., iV. indicus P., N. incompletus N., 

 jV. unifasciatus P., and X. episcopi Kellogg. 



Neophilopterus incomplettjs Nitzsch (5, p. 97). 



This is the only member of the new genus included in the 



* I have no evidence to show that NeophiJopferns is a derivative of ILhliecvs. 

 Evolution, therefore, may have gone the other way. 



