THE AMERICAN ENTOMOLOGIST. 



83 



surface, the posterior fold bearing a row of spines 

 similar to those on the thorax ; sides wrinkled, 

 with tubercular prominences between the seg- 

 ments, and one or two spines anterior to those 

 of the dorsal row ; ventral surface, each segment 

 with three transverse ridges, one median, slightly 

 in advance of the two lateral ridges ; two last 

 segments smaller, the terminal with an anal pro- 

 jection consisting of two large retractile tubercles, 

 directed upwards and bearing spiracles, sur- 

 rounded by six radiating spiny processes. Color 

 dull white, darker at the extremities. Length 

 when moderately distended 5"""= .21 in. Several 

 specimens in alcohol. 



The larva of the European Phora Dauci, ob- 

 served by Bouche in rotten radishes, is figured 

 without detail by Westwood, (Int. to Class" ii. 

 Fig. 132, 12) that of P. incmssata, found in bee- 

 hives, is reproduced in Packard's Guide. Both 

 agree with this larva, as far as the figures and 

 descriptions go. 



Chthoniiis Packardi Hagen, n. sp. — (Fig. 24, 

 f5 , enlarged fifteen times, b left mandible from 



below, c feathered bristle of the mandibles more 

 enlarged, (/ movable finger of mandible, occas- 

 ional in 2 , ^ chela of the palpus, / termination 

 of tarsus, g plantula from above.) " Dull whitish, 

 mandibles and palpi very light brown, segments 

 of the abdomen yellowish white. Thorax flat, 

 a little longer than broad, quadrangular ; very 

 little enlarged just before the anterior border and 

 a little narrowed behind in female ; lateral bor- 

 ders nearly straight, a little convex just before 

 the anterior border, where the eyes should have 

 been ; angles rectangular, the hind ones scarcely 

 rounded ; no eyes ; thorax smooth with a few 

 sensitive bristles, four on each side, two near the 

 anterior border and two near the posterior one ; 

 two more in the middle each side nearer to the 

 anterior border, which is a little produced in 

 middle ; mandibles large, one third shorter than 

 the thorax ; base convex above, oblong, a little 

 V narrowed to the 



[Fig. 24.] fingers, which are 



shorter than the 

 base ; the movable 

 finger incurved, 

 strongly pointed, 

 with sometimes a 

 small knob or ex- 

 ternal indentation 

 before the tip ; on 

 the underside of 

 the base, just be- 

 fore the division 

 into fingers, inter- 

 nally three long 

 feathered bristles 

 placed in a line, 

 usually larger on 

 the left mandible, 

 sometimes want- 

 ing (or rubbed 

 oft?) ; abdomen 

 less than twice as 

 long as the thorax, 

 scarcely broader 

 at base, ovoid, 

 thicker in the fe- 

 male ; two rows of 

 hairs on the seg- 

 ments I to 3, four 

 rows on the three 

 following seg- 



ments, and six 

 rows on the two 

 following seg- 



ments ;* a trans- 



„ „ T 1 J £r. • 7 j-1.1 versal row of hairs 



Chthonil's Packardi: «, 6 enlarged fifteen times; /;, mandible; , , 



c, bristle of the mandible ; d^ finger of the mandible ; ^, chela of palpus ; ^n eacn ventral 



y, end of tarsus ; g\ plantula (after Hubbard). segment. Male 



with the second ventral segment triangularly ex- 

 cised ; female with two small holes ; palpi thin, 

 longer than the body by about the length of 

 their fingers ; hypopodium oblong, incurved ; 

 trochanter short, enlarged at tip, incurved, 

 about half as thick as long ; femur very long, 

 straight, cylindrical, slender, a little convex above 

 before the tip, as long as the thorax and the three 

 basal segments of the abdomen ; tibia similar to 

 trochanter, incurved, enlarged at tip, less than half 

 as long as the femur ; chela thin, one half longer 

 than the femur ; the hand as thick as the tibia, 

 cylindrical, a little enlarged below just be)rond 



The pupa is visible 

 through the skin 

 of the larva, which 

 becomes an indu- 

 rated puparium, 

 light red in color, 

 oval, pointed at 

 the ends, smooth 

 and convex be- 

 neath, more de- 

 pressed on the 

 dorsal surface, 

 which is margined, 

 with the segments 

 indicated by ridg- 

 es. The extremi- 

 ties of the pupari- 

 um show the parts 

 of the larva un- 

 changed. Length 

 3.6""" = .14 in. 



All the stages 

 were found on of- 

 fal in Washington 

 Hall, Mam. Cave, 

 Aug. 2ist. Ima- 

 ges appeared from 

 pupae taken to De- 

 troit, Michigan, a 

 week later. 



Dr. Hagen has, with the greatest liberality, 

 placed at my disposal his unpublished descrip- 

 tions and figures of new Pseudo-scorpions be- 

 longing to the genus Chthoniiis. The following 

 is the description of the cave species. The few 

 changes I have taken the liberty of making in his 

 manuscript, have been rendered necessary by 

 new facts developed in correspondence, and in 

 an article published in advance of the descrip- 

 tions by Dr. Hagen in the Zoologischer Anzeiger, 

 Leipzig, July 1879. 



*The number of hairs is found to vary on the abdomen, Hub. 



