August 1S92.] 



PSYCHE. 



299 



festing the jack-rabbit, I have on sev- 

 eral occasions taken small Dermatobia 

 larvae from cotton-tails. 



On October 10, 1S91. nine cotton- 

 tails were shot at Joblin's ranch, in the 

 San Andres Mts. Seven bots were 

 taken from beneath the skins of these. 

 Two, and even three, were found in 

 the same cyst or "warble." Each cyst 

 communicated with the outside by an 

 orifice through the skin. The bots 

 were found on the back, belly and 

 shoulders. They are more shortened 

 in form than those taken from the jack- 

 rabbit, and become of a brown instead 

 of a gray tinge after immersion for 

 some time in alcohol. The following 

 is a description of them : 



Larva of Cuterebra sp. from Lepus arte- 

 misia ( ?) — Elongate oval, thick, broader be- 

 hind than in front, dorsal surface convex in 

 profile, ventral rather concave; first and 

 eleventh segments appearing nearly equal in 

 width when the latter is extruded, but the 

 eleventh appears smaller when sunken ; seg- 

 ments gradually increasing in width from 

 first to seventh, the seventh segment widest, 

 remaining segments decreasing in width pos- 

 teriorlv; tenth segment telescopic, some- 

 times protruded when the eleventh becomes 

 more clearly outlined. All the segments, ex- 

 cept the first and eleventh, densely and 

 equally covered, both above and below, with 

 short horny spurs, not spiny, the first seg- 

 ment less bare than the eleventh. One pair 

 of small, straight, approximated black jaws; 

 antennae rather removed basally, approxi- 

 mated distally meeting the jaws, each anten- 

 na with two small ocellus-like dots on upper 

 surface ; in one specimen the antennae are 

 horny and black so that the dots do not show : 

 jaws and antennae sunk in a crescent-like or 

 semicircular transverse cavitv in the first or 



cephalic segment, the first segment with a 

 median notch in its upper anterior margin. 

 Anterior (or superior) stigmatal plate of last 

 segment sub-circular, more or less complete- 

 ly bifid longitudinally, situated in an a cres- 

 centic transverse furrow or cavity, the furrow 

 appearing long crescentic when the tenth 

 segment is extruded, but short and hardly 

 crescentic when notextruded ; posterior (or in- 

 ferior) plate situated in an elongate transverse 

 pit, the margin of the segment below pit 

 bearing a median notch and a slight lateral 

 one on each side. Length, 18 to 20 mm. ; 

 width of 7th segment, 9 to 9.75 mm. De- 

 scribed from two specimens collected Oct. 10. 

 San Andre* Mts., New Mexico. 



On October 10, a jack-rabbit was 

 shot near Joblin's ranch, San Andres 

 Mts., from beneath the skin of which 

 six bots were taken, mostly on the back 

 and about the root of the tail. They 

 are rather elongate, and whitish. 

 Each one lay in its cyst or "warble" 

 The following is a description of them : 



Larva of Dermatobia sp. from Lepus 

 callotis. — Elongate conical anteriorly, taper- 

 ing posteriorly, not stout and thick, broader 

 in front than behind, dorsal surface convex 

 in profile, ventral concave; first segment 

 small, much smaller than eleventh ; segments 

 gradually increasing in width from first to 

 sixth, the sixth segment widest, remaining 

 segments decreasing in width posteriorly : 

 eleventh strongly extruded, joining the tenth 

 by a constricted neck, more or less spherical 

 rather truncate posteriorly. Segments after 

 the first sparsely covered with short black 

 curved spines, showing most plainly recur- 

 vate on last segment, which is nearly or 

 quite bare on posterior surface. One pair of 

 very small, rather removed, straight black 

 jaws, situated in a crescentic transverse slit; 

 antennae approximated, ocellus-like dots 

 not visible, a pit in the first segment above 

 and behind the antennae. Stigmatal plates 



