592 ARANE.E OF NORTH AMERICA MARX. 



The structural characters of this spider, however, are such as to separate it from the existing European 

 genera, and I, therefore, let it stand provisionly as a new genus in the family. 



6. Clubionidce. — "With the same right and for the same reason that the family Agalenidce, Thorell 

 etal, has lately been divided into DictynidcesinA Agalenidce, the family Drassidce ought to be split. It 

 has been acknowledged long ago that this family contained very heterogeneous elements, which had, 

 however, concentrated themselves into two natural groups, one containing such forms as have the in- 

 ferior spinnerets separated from each other, the maxilla? impressed transversely, and which live gen- 

 erally on the ground, under moss and stones, and are more nocturnal in their habits, while the mem- 

 bers of the other groups live generally on plants and trees, their habits are de.cidedly diurnal, the 

 spinnerets are here contiguous, and the impressions on the maxilla? are wanting. Simon recognized 

 the value of these characters by giving to each the rank of a subfamily. I go a step further and 

 raise the subfamily to a family. 



7. Corinna.— C Koch, in describing (Die Arachniden, ix, p. 18, 1842) the first species of the five in his 

 genus Corinna remarks that the species of this genus can he divided into two natural groups; the 

 first has the anterior middle eyes the largest, and the, four middle eyes stand in a square ; the second 

 group contains those in which the anterior middle eyes aro not larger than the others, and the four 

 middle eyes stand in a trapez, narrower in front. To the first group belong rvbripes and nigricans, and 

 to the second memnonia, cinculata, amccna, and tricolor, species from the United States. Should we 

 form from these two groups separate genera, the generic name Corinna would have to be retained for 

 tho first group, as it contains the species first described, and this, of course, is the type of the genus if 

 not otherwise stated. Corinna, then, has the anterior middle eyes largest. 



Keyserling published (Verhandl.d. zool.-botan. Gesellsch. Wieu, 1879, p. 335) a new genus, Cas mneira, 

 closely related to Corinna, and its characteristics are exactly those of Corinna in the new definition ; 

 that is, the anterior middle eyes are the largest. 



Karsch (Zeitschrift fiir ges. Naturwiss., liii, p. 373) divides the genus Corinna K. into the following 

 genera: 



c Abdomen with a horny basal shield 2 



( Abdomen without a horny basal shield 3 



c Anterior middle eyes largest, mandibles very strong, I legs longest Corinna Koch 



I Anterior middle eyes not largest, mandibles small, directed back, IV legs longest. Thargalia Karsch 



( i legs very much tho longest Mundane Karsch 



I IV legs the longest 4 



r Mandibles and claws extremely long Megalostrata Karsch 



\ Mandibles and claws of medium size Corinnomma Karsch 



This later genus is Thorell's Corinna severa (Studi sui Ragni Males et Pap. 1. Ann. del mus. civ. de 

 Genova,X,1877,p.481). 



Keyserling, in describing Castianeira bivittala from Massachusetts (Verb. d. z. b. Ges. Wien, 1887, p. 

 442) asserts that Thargalia is synonymous with Castianeira. 



Now the case stands as follows: Keyserling's first mistake was to form his genus Castianeira for 

 Corinna, and his second to assert that Thargalia is synonymous with Castianeira. On the contrary, 

 Castianeira is a synonym of Corinna, and has to be dropped, and C. Koch's second group is Thargalia 

 Karsch. This latter genus contains the most common of the United States species. 



Enierton's new genus Ceotrecha (New Eng. Drass., Agal., and Dysderidse, Trans. Conn. Ac, VII, p. 

 4) is nothing more than Karsch's Thargalia, and has to go, therefore, to the same synonyms. 



8. Catadysas was found by Hentz but once — an undeveloped male— and has since not been found 

 again. We have, therefore, to rely upon the meager description of Hentz. Fortunately, Hentz gavo 

 us a good illustration. Thorell formed a new family for this peculiar genus, the Catadysoidce, and 

 assigned it to a place among tho Territelarice on account of the vertical movement of the mandibular 

 claws and the insertion of the maxillary pulpi into the tip of the maxillae. Ausserer in his Beitr. z. k. 

 d. Territel. followed Thorell in this arrangement. As the Territelarice are composed exclusively by 

 tetrapneumonic species and form thus a natural group of distinct characters, and as Catadysas possesses 

 only two lamellar trachea) I hold that its proper place is among the Dipneumones, and as Holmberg 

 gives his reasons in Bolet. Acad. Argentin.,IV, p. 153, that Catady^asis a Drassid, which seems to me 

 very probable, I have placed this family near the family Clubionidce. 



9. The statement of Emerton that Tegenaria medicinalis Hentz is a Coelotes, and a synonym of his 

 Ccelotes medicinalis, is merely a lapsus calami. 



10. Ilamataliva.— This very interesting slider, of which Ionlypossessedtwospecimens, bothfemales 

 one of which I presented to C ount Keyserling, has been by this author assigned a place in the family 

 Agalenidce. Keyserling himself was in doubt as to the right place for this abnormal species, but 

 thought that this family offered greater affinities than any other. I think, however, that we ought 

 to form a new family for Ilamataliva, the Ilamatalividce. Unfortunately I have only one specimen, 

 and this is not in perfect state. I, therefore, leave it provisionally in its old place. 



11. Prodidomidce.— Thorell proposed a new family in 1875 for the genus Miltia for the reason that 

 the characters of this genus were not in conformity witli the family Enyoidce to which Simon had 

 assigned it. Thorell gave this family the name Miltioidce and placed it between the Enyoidce and 



