252 UNIVERSITY OF COLORADO STUDIES 



Family ORIBATID^ 

 An apparently new species of the genus Cymbaremmiis Berlese was collected at 

 Tolland by Mr. Bethel, and determined by Mr. Banks. 



SUPEREAMILY HyDRACHNOIDEA 



The water mites. Our species have not been studied. 



Superfamily Sarcoptoidea 



Palpi small, three-Jointed, adhering for some distance to the lip; ventral 

 suckers at genital opening or near anal opening generally present; no eyes; tarsi 

 often end in suckers; adult frequently parasitic (Banks). 



Family TARSONEMID^ 

 With tracheae; no ventral suckers; body divided into cephalothorax and abdomen; 

 the female with a club-shaped process between the first and second legs. The 

 genus Siteroptes Amerling is represented at Denver by 5. carnea Banks (deter- 

 mined by Banks), found by Mr. Bethel in galls on Sporobolus asperifolius. The 

 galls are almost exactly like those on Cynodon dactylon, attributed to LonchcBa 

 lasiophthalma Macq. Mr. Banks notes that a red predaceous mite (family Bdelli- 

 dae) also occurs in the Sporobolus galls. 



Family TYROGLYPHIDiE 



Pale-colored, soft-bodied mites, devoid of tracheae, usuallj^ with prominent chelate 

 mandibles, small palpi; moderately long legs, ending in one claw and often a 

 sucker (Banks). During the hypopial stage they are attached to insects or 

 sometimes mammals; this is a migrating condition, and during it the mite takes 

 no food, 

 (loi) Trichotarsus Canestrini.* Hypopial stage on bees. A probably new species 

 near T. osmice Duf. (det. Banks) was found on the type specimen of the bee Ostnia 

 leonis Ckll., collected by Miss Edna Baker on the University campus. 



Superfamily Trombiboidea 



The last joint of the palpus forms a thumb to the one before, which ends in a claw; 

 body often with many hairs. 



Family TROMBIDIID^ 



Mandibles chelate (for biting). 

 (102) Trombidium Fabricius. The larvae are six-legged mites and are parasitic 

 on insects; the bright red adults wander over the ground, and our species is known 

 to destroy grasshopper eggs. T. locustarum Walsh, Boulder, February, 1907 

 (W. P. Cockerell); determined by Banks. In his catalogue of the Acarina, Mr. 

 Banks places T. locustarum in a separate genus Microtrombidium Haller. In his 

 Treatise on the Acarina (1904) he says: "our species are all practically congeneric, 

 but those forms that have two claws at the tip of the palpi fall in the genus Micro- 

 trombidium." 



