MITE'S OF SUBFAMILY HAEMOGAMASINAE — KEEGAN 243 



widely expanded posterior to coxae IV and curved anteriorly lateral 

 to coxae ; does not cover entire ventral surface ; setation as in female ; 

 pores as in female except that middle pair of sternal pores are not 

 horizontal ; anal region not abruptly set off from remainder of shield. 

 Peritreme not joined to coxal fovea as in female; only an indication 

 of the median invagination of the female. Epistome very faint; 

 apparently fimbriated, but details could not be seen. Chelicerae dis- 

 play marked sexual dimorphism. Fixed chela toothless, but with a 

 distal seta as in female. Movable chela divided near its base into two 

 branches ; the shorter branch has a curved, pointed tip and bears one 

 tooth about midway on its length ; the longer branch is twisted and is 

 bent at a right angle distally ; possesses a truncated tip and a tiny 

 spur near the tip. Maxillary setae as in female ; notched corniculi dis- 

 tinctive. Palpi as in female. Legs as in female, both in relative 

 size and setation. 



Nymph. — Dorsal shield more narrow than in adults and with a slit- 

 like invagination on each side at level of coxae IV; setation as in 

 female. Setae of unprotected dorsal integument as in adults. Trito- 

 sternum and presternal area as in adults. Setation and pores of 

 ventral shield as in female, except that posterior pair of sternal setae 

 are more median in position. Anal shield as in female. Peritreme 

 not well developed. Epistome, chelicerae, palpi, and legs as in 

 female. 



Remarhs. — Distinctive characteristics of E. oudemansi that make it 

 possible to distinguish female, male, and nymph from those of other 

 species are : Female : Sparse setation and six pairs of pores on dorsal 

 shield ; deeply invaginated posterior margin of sternal shield ; small 

 number of setae on genitoventral and anal shields ; median invagina- 

 tion of posterior margin of peritreme; spikelike epistome. Male: 

 Sparse dorsal and ventral setation as in female ; distinctive structure 

 of peritreme, epistome, chelicerae, and maxillae ; setation as in female. 

 Nymph : Sparse setation, mouth parts as in female. 



The description given above differs from that given in Hirst's paper 

 in a few details. Hirst does not mention or figure the distinctive pores 

 on the dorsal shield, and he figures the anterior pair of maxillary setae 

 as barbed, whereas they are clearly smooth in all specimens in the 

 U. S. National Museum collection. Neither does he mention the struc- 

 ture of the peritreme nor figure it clearly. His figure of the anal 

 shield does not include the distinctive anterior prominences found on 

 all specimens examined. His figure of the chelicerae differs slightly 

 from the condition found in specimens examined. He does not figure 

 or mention the invagination on the lateral margins of the shield of 

 the nympth. 



Womersley's Eulaela'ps mawsoni, as figured in his 1937 paper, is 

 undoubtedly E. oudemansi. 



