104 Bulletin of the Brooklyn Entomological Society Vol. XV 



towards greater specialization are in the main as follows : reduc- 

 tion in the number of segments of the rostrum to three, mem- 

 brane without nerves, metasternum without odoriferous orifices, 

 hind coxae of the trochalopodous type, two segmented tarsi, 

 claws with arolia. From the foregoing it is extremely difficult 

 to trace the phylogeny of this group but it probably is a relic of 

 a Proto-Lygaeid stem. On the whole but particularly because of 

 the presence of arolia and the structure of the head Xylastodoris 

 seems to me less primitive than the other two genera. 



The external genital armature of the male is to me the most 

 remarkable peculiarity of this genus as nothing at all resembling 

 it occurs in the Hemiptera, outside of this family. The identity 

 of the respective sexes has in fact given me considerable trouble, 

 and the subject is by no means entirely clear to me yet. In fixing 

 the sexes I have been obliged to depend upon the remarks of Dr. 

 Bergroth as my guide and yet this reliable authority unfortu- 

 nately fails to indicate his reasons for the demarcation of the 

 sexes. Judging from the external appearance of the venter I 

 should have reversed the sexes for what is indicated as the male 

 (Sec. Bergroth) appears to me to be the female with an asym- 

 metrical ovipositor and the ventral aspect of the female (Sec. 

 Bergroth) resembles the terminal ending in the male of several 

 families where the genitalia are covered below. Furthermore it 

 is rather peculiar that the male abdomen is wider than the female 

 one. 



Note: It may be worth while to remark that the investigation 

 and original drawings by the author have been made with a No. 4 

 ocular and an A-2 objective of a Zeiss binocular. 



Fig. I 

 Fig. 2 

 Fig. 3 

 Fig. 4, 

 Fig. 5 



Dorsal view of c? Xylastodoris luteolus n. sp. 

 Ventral view <^ Xylastodoris luteolus n. sp. 

 Venter of $ Xylastodoris luteolus n. sp. 

 Tarsus of Xylastodoris luteolus n. sp. 

 Wing of Xylastodoris luteolus n. sp. 



