1920] Ewivg: Genus Trom-hicida Berlese 387 



York City. The three drawings here given are all made from 

 the type. 



This Trombicula is quite distinct from T. coarctata, as has 

 already been pointed out. It is at once distinguished from the 

 species found in Maryland and Virginia by having only vestigial 

 eyes, the pseudostigmatic organs arising inside of the pseudo- 

 stigmata, and by having the body setas much longer and color- 

 less. Little is known of its habits. Since all the specimens were 

 found above the soil and the species has not completely lost 

 its eyes, it may be inferred that it is not subterranean in habits. 



Trombicula cinnabaris n. sp. Color of live adults scarlet vennilion, 

 or cinnabar. Cephalothorax triangular and with the crista extending 

 for its entire length. Carina of crista extending from the anterior end 

 of the latter as a straight ridge to about the middle of the triangular, 

 pseudostigmatic area. Posterior lobes of pseudostigmatic area evenly 

 rounded and near the median line. Pseudostigmatic organs arising 

 from pseudostigmata and provided with a few minute barbs on their 

 posterior margins near their tips. Eyes well developed, very near the 

 pseudostigmata and with thick and strongly curved corneas. Palpi 

 armed with three tibial spurs, the longest of which is less than half as 

 long as the palpal claw ; thumb of palpus not swollen and not surpassing 

 the palpal claw. Cheliceras with lower chela sharp and provided with 

 about two dozen backwardly directed teeth ; upper chela represented by 

 a chitinous tubercle-like knob. Abdomen clothed with the usual setae, 

 which are but slightly, if at all, longer on the posterior border than on 

 the shoulders, and have the barbs smaller at the somewhat tapering 

 tip. Legs about as usual, the first pair being much the largest and 

 longest. The tarsi of this pair are one and forty-seven hundredths times 

 as long as the tibiae. Posterior legs reaching to the tip of abdomen. 

 Length of medium-sized specimen, 0.92 mm.; width, 0.52 mm. 



From East Falls Church, Virginia; summer of 1919; by the 

 writer. From North Beach, Maryland; summer of 1919; by 

 the writer. Found both in the soil and on the surface of soil 

 under dead leaves and bits of decaying vegetable matter. 



Described chiefly from the type which was taken at East 

 Falls Church, Virginia, August 21, 1919, from soil of a black- 

 berry patch which was heavily infested with chiggers. This, 

 our Eastern Trombicula, is most closely related to T. minor 

 {mediocris) Berlese. It is differentiated from Berlese's species 

 by having only three spines on the palpus instead of four and 

 in being considerably smaller. 



The adults of T. cinnabaris probably spend most of their 

 time on the surface of the ground, where they go about under 



