183 



seated in great proportion in a lot of specimens from the vicinity of 

 Chicago, III. In the District of Columbia it is rare, but a single spec- 

 imen having been found the present season. 



-i^ 



L. DUBIA sp. nov. 



Completely resembles the preceding in all outward appearance and 

 habitus. The ventral characters of the male must be resorted to for 

 the identification of that sex. 

 As appears from the figure 

 the ridge is decidedly more 

 curved than in the preced- 

 ing species, and is in every 

 respect more distinctly 

 marked. The primary char- 

 acters will show on compari- 

 son with the previous fig- 

 ures a considerable change 

 in type, which indicates ap- 

 parently a greater diver- 

 gence between this and fusca 

 than there is between fusca 

 and grandis. In the female 

 the last ventral segment is 

 emarginate, and it is there- 

 fore easily distinguished 

 from that of fusca. In the 

 corneous characters of the genitalia the differences noted in the male 

 are emi)hasized. The pubic process here becomes broad, stout, some- 

 what contracted medially, and divided superiorly into two branches 

 which are broad, somewhat ilattened, and obliquely truncate. The 

 superior i:)lates are narrow, linear. 



Altogether, it is a distinct species, showing quite a distinct differ- 

 ence in type in the genital structure of both sexes. 



This species we have from Massachusetts, New York, 'New Jersey, 

 Maine, Xorth Carolina, District of Columbia, EUinois, Ohio, Texas, 

 Colorado, Tennessee, Nevada, Montana, California, Wisconsin. Of 

 all the others this extends farthest west, and the race cephalica Lee. 

 belongs to this species. It is fairly numerous at New York 5 forms 

 a fair proportion of the specimens received from Chicago, 111., but is 

 rare at Washington, no specimens having been collected this season, 

 and only a few specimens in the local collections indicating its occur- 

 rence. 



L. ARC U AT A sp. uov. 



This species is as a whole rather smaller than either of the others, 

 although it has probably as great an average length. From dubia 



Fig. 42.— Lachnosteknauubia. 1, clasper of male from front 

 and above; 2, clasper of male (rijiht) from side; 3, clasper 

 of male (left) from side ; 4, ventral characters of male ; 

 5, genital structure of female ; 5a, pubic process ; 56, supe- 

 rior plates; 5c, inferior plates— enlarged (original). 



