﻿PROCEEDINGS OF THE NATIONAL MUSEUM 



The type series consists of 14 males and 13 females collected from 

 four different individuals of the type host, between May 26 and July 

 21, 1945. 



MEASUREMENTS OF TYPES OF CORVICOLA INSULANA 



Structure 



Male 



Length Width 



Female 



Length Width 



Body. 

 Head 



at antennae. 



[at temples 



Prothorax.. 



Pterothorax. 



Abdomen 



Antennae (see. 1-2 in "b: in ? entire). 



Basal plate 



Parameres 



Endomera 



1.63 



.52 



.195 



.24 



.84 



.22 



.18 



.133 



.07 



0.326 

 .456 

 .163 

 .436 

 .52 

 .068 

 .08 

 .13 

 .054 



1.56 



.53 



.152 



.26 



.81 



.217 



0.38 

 .456 

 .303 

 .48 

 ,63 

 .04 



Genus RALLICOLA Johnston and Harrison 



RALLICOLA GUAMI, new species 



Figure 1, e, / 



Types. — U. S. N. M. No. 58958, male and female adults, from Rallus 

 owstoni, collected by Rollin H. Baker on Guam Island (Marianas), 

 January 26, 1945. 



Diagnosis. — This species belongs in the group comprising bisetosus 

 (Piaget), californicus (Kellogg and Chapman), affinis (Piaget), and 

 attenuatus (Nitzsch), being perhaps closest to the first two. I have 

 specimens of species of Rallicola, as yet undetermined, from Gallirallus 

 (New Zealand), Pardirallus (Peru), lonornis (Colombia), Aramides 

 (two species, BrazU and Colombia), Laterallus (two species), and 

 Rallus longirostris subsp. 



Apparently the species of Rallicola found on the true rails form a 

 very compact and closely related group. Those from Fulica are of a 

 different type; a third type is from Laterallus alhigularis cinereiceps. 

 As in the others of this group, there is a slight dimorphism in the 

 antennae, the first segment of the male being almost as long as the 

 second, while in the female it is only half as long. The clypeal signa- 

 ture extends beyond the ends of the clypeal bands and is convex in 

 front, and the whole frons is encircled by a wide hyaline flap, begin- 

 ning at the ends of the clypeal bands; the signature is almost circular, 

 only the sides being slightly flattened. The clypeal bands are strongly 

 sinuate along the darkened inner edge and are slightly broken at the 

 suture; the inner bands, which support the signature, bend outward 

 to the marginal bands and are fused with them just behind their 



