80 



EEPOKT 108, U. S. DEPAKTMEXT OF AGRICULTUEE. 



13. Dorsal shield dh-ided ; body more elongate, and truncate behind Zercon. 



Dorsal shield entire ; body rounded Seiodes. 



14. Leg II of male with processes below; vulva often large; claws of hind legs 



often long pedicellate (Parasitini) 20 



Leg II of male without processes; vulva never very large, often but a trans- 

 verse slit ; claws of hind legs not long pedicellate ; dorsal shield not divided 

 (Laelaptini) 15 



15. Hind femora calcarate: genito-ventro-anal shield in one; leg I long and 



slender Neoherlesia. 



Hind femora not calcarate 16 



16. No claws, but large caroncles to the tarsi; anal plate separate Myrmozercon. ^ 



Claws as well as caroncles to the tarsi 17 



17. Coxse and ventral shield with stout bristles or spines; epistoma short. 



rounded ; parasitic on small animals Laelaps. 



Coxse and ventral shield at most with hairs 18 



18. Anal plate of male united to the other plates; female genital and ventral 



plates often united; epistome usually elongate and toothed Hypoaspis. 



Anal plate separate in both sexes 19 



19. Epistome with a long, hairy, median spine; anal plate rather small Eyletastes. 



Epistome scarcely pointed; ventro-anal plate usually large and broad Seiulus. 



20. Female ventral shield united to the genital, not to the anal; ^T.ilva scarcely 



in front of coxse IV; dorsal shield entire Pachylaelaps. 



Female ventral shield not united to the genital 21 



21. Female genital shield triangular, anteriorly pointed; hind tarsal claws 



usually long pedicellate 22 



Female genital shield not anteriorly pointed; hind tarsal claws short 



pedicellate 23 



22. Female dorsal shield divided Parasitus. 



Female dorsal shield entire Hologaviasus. 



23. Dorsal sliield entire in both sexes Hydrogamasus. 



Dorsal shield divided in both sexes 24 



24. Female anal sliield united to the ventral shield Gamasellus. 



Female anal shield separate from the ventral shield Cyrtolaelaps. 



Besides those tabulated above there are 

 ^(\.^ a great many genera and subgenera pro- 



posed in recent years, mostly by Berle:r;e 

 Most of these differ from others only iu 

 minute characters usually present in but i 

 one sex ; the more prominent of these genera 

 ^v^ are referred to below. 



In Epicrius, which has not yet been re- 

 corded from this country, the dorsum has 

 a regular pattern of tubercles, 

 r \ .ff i) T iVJ^'Xr Several species of Caelenopsis (fig. 156) 



^"^ \\\ rt ;;/^/7'Vj\^ have been described; one was found at- 



\\ \{\\ n j^ 7 }X tached to a histerid beetle, Hololepla. 



vS^mJ^ V 9 another on Passalus. and the third on tli(> 



^N>^1^ N^v'^y/ .--T^N larva of a beetle. There are many tropical 



^vOj \ ^^^==^^ /^;/D" ^ species of the genus. 



^H\, idhS^ '^^^ remarkable genus Rhodocarus (Hl:. 



^^ ^iii^s>^ 25Q^ jg known from only one species, whic h 



occurs in Europe. 

 Fig. 152.— Iphiopsis sp., caroncle and peritreme. —,. „ i xi x i i 



(Original ) ^•'^^ gonus Euzcrcon has the ventral pla i rs 



as in Caelenopsis, but the anal plate is small 

 and separate; there are no claws to the front legs and the body is margined by a row 

 of long stout bristles. The species arc from South America. 



Mcgislhanus includes a number of large tropical parasitids, recognized by their 

 large size and toothed hind femora. One species, M. floridamis Banks (fig. 151), has 

 been taken in Florida. Some species are 4 mm. long and have a caudal projection 

 fringed with hairs. They are most abundant in the Malay Archipelago. 



