DELFINADO: LAELAPTOID MITES OF THE PHILIPPINES 111 



Genus Ornithonyssus Sambon, 1928 

 Ornithonyssus parvus, new species. Figure 41, A, B. 



The small, suboval dorsal plate with about 23 pairs of long setae, 

 the trapezoidal sternal plate, and the small, narrow epigynial plate 

 will serve to distinguish this species. 



FEMALE : Gnathosomal setae moderately long, subequal to medial posterior 

 hypostomal setae; chelae strong, not toothed. Dorsal plate small, suboval, nar- 

 rowing posteriorly, with about 23 pairs of long, slender, subequal setae, 664 n long. 



i/i 





V 



B 



V 



Fig. 41. Ornithonyssus parvus, female: A, dorsum; B, venter. 



338 fx wide. Sternal plate trapezoidal, the posterior and lateral margins concave; 

 3 pairs of setae short, subequal in length. Epigynial plate small, narrow, bluntly 

 pointed posteriorly, with a pair of short setae. Anal plate elongate, about twice 

 as long as wide; anal opening large, near the anterior margin of the plate; adanal 

 setae shorter than the postanal seta and located near the anterolateral margin of 

 the plate. Setae on venter fairly numerous, long and slender, those on the poste- 

 rior margin much longer and serrate. Peritreme reaching the anterior margin of 

 coxa I. All coxal setae short and slender. 



MALE: Similar to female except for the following differences: Chelae strong, 

 tip of fixed chela rounded, slightly bent, and longer than movable chela. Holo- 

 ventral plate undivided, slightly expanded behind coxa IV, narrowing toward anal 

 plate; 9 pairs (including adanal setae) of moderately long setae subequal in length 

 to the postanal seta. Ventral and coxal setae as in the female. Dorsal plate 568 /x 

 long, 338 n wide; nearly covers the entire dorsum, the posterior lateral margin 

 rugged, irregular in shape, and with a strong median projection; setae stronger and 

 longer than in the female. 



