NO. 1382. 



THE ACARINA OR MITES— BANKS. 



■93 



reestablished when it reappears on the outside. However, it is prol)- 

 able that more is to be learned regarding- these subcutaneous forms. 

 In this country irijpodectes has been taken from the pigeon and l)hie 

 heron, while Mr. Beebe has recorded a similar form from various 

 birds in the New York Zoological Park. This latter form is supposed 

 to have caused the death of a number of l)irds. 



In Pteralloptes the males have the third legs but little larger than 

 front legs, and end in a sucker. They have usually been taken from 

 tropical l)irds. 



In Pteronyssm the male has the third pair of legs nuich longer than 

 the fourth, wdiich is very small. The tip of the abdomen is nearly 

 truncate in both sexes, but in the 

 male there is often some indication 

 of two lobes. Three species have 

 been described from Canada: PL 

 f</mple.''\ on the red-breasted wood- 

 pecker; Pf. sjj^ciosus, on the sap 

 sucker, and Pt tyi^reUi Canestrini 

 {fiiseus Tyrrell), on the white- 

 breasted swallow. J[i'(j)i hi Id is sim- 

 ilar to Pferonyss)is, 1)ut tlieri^ are 

 several spinesnear the tip of the third 

 legs, and the tip of the male abdomen 

 is distinctlv bihd. The}" are usually 

 brown in color, and many species 

 are known. Several are described 

 from our l)irds, as follows:^' M. 

 acideatus^ oil the l)lue jay; JA tyr- 

 rellh on the cat-bird; M. gladiatoi\ 

 on the wild pigeon; 3L forcijKitiis 

 on sand-pipers; 31. 2^ici-maj(>r!s., on 



the big sap-sucker, and M. cdhidus on the white-breasted swallow. In 

 Ancdgex the male has the third pair of legs" not only longer than the 

 others, but usually very much enlarged in the middle, sometimes 

 enormously so. On legs I and II there are one or two spur-like pro- 

 jections from the til)ia^ and tarsi, and on the base of the femur there 

 is !i reliexed spur, the olecranon process. The tip of the male abdo- 

 men is often pointed, and never deepl}" bilobed; the female has a 

 rounded tip and elongate body. The tarsal suckers are smaller than 

 in Jfcy/iinia and Plrnmy-ssw^. Five species have been described from 

 American birds: ^i. fyrarnii^ on the king-bird; ^1. hmgi-sj/rnosus, on the 

 snow-bunting; J., tridcididatii.s^ on the horned lark; A. evemidonotus. 



"Several of these species, namely, those described by Prof. Haller in the Zeitsehr. 

 f. wiss. Zoologie, 1882, are not mentioned in Prof. Canestrini's treatment of the world 

 speeies in Das Tierreich, Lief. 7, 1899. 



178.— ALL.^NAI.GES GR.Vf'II.EPIN'NATtlS. 



