183 



sented ia great proportion in a lot of specimens from the vicinity of 

 Chicago, 111. In the District of Columbia it is rare, but a single spec- 

 imen having been found the present season. 



L. DUBIA sp. uov. 



Completely resembles the preceding in all outward appearance and 

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

 the identification of thatsex. 

 As appears from the figure j. 

 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 emphasized. The pubic process here becomes broad, stout, some- 

 what contracted medially, and divided superiorly into two branches 

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

 superior plates 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, jSTew Jersey, 

 Maine, JSTorth 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; 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. ARCUATA sp. nov. 



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

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



Fir,. 42. — Lachnostekna uubia. 1, clasper of malefrom front 

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

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

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

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



