VOL. > 



189^ 



XVI, -1 



PROCEEDINCJS OK THE NATIONAL MUSEUM. 



551 



lAiihiDuim {!) veiitricositm (Wood). Weed, Aiiicr. N;it., xxi, 9S5. 

 Liobuuum ( ?) vent rie<»i Kin (Wood). Weed, liull. 111. States LaL. Nat. Hist,., in, lOt. 

 Liohiinum ventrloofsum, (Wood). Weed, Aiucr. Nat,, x\i\, 918: Trans. Am. Eii(. Soe., 

 XIX, 188. 



Male.— Body 7 long; 5 wide; i)a]i)i G lono-. Lcos: (irst 35"""; 



second, 08"""; third, 35"""; fourth, 53"'". 



Body elongate; abdomen conical or pear-shaped. IJorsum, legs in- 

 cluding trochanters, and i)alpi varying from dark cinnamon-brown to 

 ferruginous brown, mosfe commonly cinnamon rufous. Veutrum light 

 grayish brown. Dorsum closely granulate with an indistinct darker 

 marking, and numerous small grayish spots arranged in irregular 

 transverse series. Eye eminence black, except at base; rounded, not 

 (paniculate, smooth, or with a iVw small, acute tubercles. Palpi rather 

 slender, with none of tlu^ angles prolonged; femur with a very few small 

 spinous tubercles and hairs; patella strongly, and femur and tibia 

 slightly arched; coxa' minutely tuberculate, tip])ed with white; tro- 

 chanters and legs cinnamon rufous; tai'si dusky. Legs long aiui moder- 

 ately robust. Genital organ of male "flat, nearly straight, slender at 

 the basal portion, gradually' wi<lening and distally rallier quickly ex- 

 panded into a broad alati^ portion, and then abruptly contracted into 

 a moderately robust, slightly curved point, which isi)lac('(l at an angle 

 to the rest of the shaft; at the base of the point a marked notcli in the 

 end of the shalt. 



Female. — Body 10.5""' long; 5.5'""' wide; pali)i 5" " " long. Legs: tirst, 

 32"""; second 02"""; third, 32'""'; fourth, 45"'". 



Differs from the male in the very 

 nuich larger size of its body. The 

 abdomen in most specimens is greatly 

 swollen, especially below. 



Ohio: Franklin County, June 13, 

 ]889; July 8, 1890; Septend^er 25-30, 

 1888; Warren County, August 7, 1890. 



The inunature form of this species 

 was described by Wood as Phalan- 

 {/iumforjnosum, and was later referred 

 by myself to the genus Forbesium. 

 The young occur rather connnoidy 

 during autumn, winter, and sirring, 

 under boards and logs, being very 

 much more abundant than I have 

 ever found the adults. Th(\y l)ecome 

 mature early in June. 



This immature form as found in spring shoftly before maturity is 

 represented in lig. 1, and is described as follows: 



Dorsum remarkably smooth, mottled with gray and blaekish brown; a wide, dark 

 brown or black central niarking connnences on the ceiihalic margin and runs (o the 

 middle of the lii'th abdominal segment, where it abruptly t<'rmiuates ; itis expanded 



Fii;. ) .— I,i. ;hiiiri(m iM'iitricostdii. Iiniiiiiturc: 

 ((, liddy ; I), l■^;^^, I'.iiiinclicc, side viuw ; c, 

 saiiK^, front view; d, palpus; c, i);ili)al daw; 

 all nia<jiiifiiH]. 



