247 



his Th. ulmi, Westring has confounded the real male of X ulmi with 

 X. erraticus cf, as may easily be perceived by the description of the 

 male's bulbus, and as I have found from specimens , which Westring 

 has kindly sent me. I have frequently taken both sexes of X. ulmi 

 in damp localities in central Sweden, expecially at Satra, and in 

 Germany I have met with it at Travemunde. 1 have in my collec- 

 tion specimens of both sexes determined by Westring himself as 

 his Th. ulmi. 



Walckenaer, Blackwall and Simon place Thorn, ulmi Hahn 

 among the synouyms of Th. (X.) cristatus, but this is not correct. 

 We may by the colour alone (conf. Hahn's figures and Westring's 

 description above referred to) without difficulty distinguish these two 

 species, and the structure of the sexual organs both of the cf and 

 $ X. ulmi immediately shows that this species is perfectly distinct 

 from X cristatus, X. Kochii (viaticus C. Koch) and others, with 

 which it might be confounded. 



As regards Th. bivittalus, I have been enabled by the kindness 

 of Prof. Stal to examine the specimen, from which Westring's de- 

 scription is taken, a dried and ill preserved cf, and I have found 

 that it is nothing else than a pale-coloured specimen of X ulmi. 

 I could not discover the least dissimilarity in the organs of copu- 

 lation. The following remarks on an ordinary specimen of X ulmi c? 

 perfectly suit Th. bivittatus. 



in procursum obtusum, ipsa parte paullo breviorem, paullo tantuin ante basin 

 lamina pertinentem, producto; subter in latere exteriore alium procursum ostendit 

 paullo longiorem quam latiorem , anteriora versus et foras directum, versus apicem 

 dilatatum, in apice truncatum, angulo apicis interiore producto et interiora versus 

 curvato. Lamina brevis, margine exteriore, ante medium, angulum obtusum for- 

 manti; bulbus subter aiqualis, leviter convexus, apice tantum impressum vel sub- 

 emarginatum ibique in spinam acuminatam, foras et retro directam et sub-curva- 

 tam, sub angulo marginis lamina? locatam, producto. .Pedes testacei, coxis, fe- 

 moribus et patellis 4 anterioribus nigro-piceis , tibiis quoque horuni pedum basi 

 anguste infuscati; pedes 4 posteriores fusco-sub-maculati et -punctati. Tibia? et 

 metatarsi 4 antici subter quaternis paribus aculeorum longorum armati. Pedes 

 l:mi paris 8V2 millim. longi, 2:di paris iis saltern non breviores. Abdomen bre- 

 viter et inverse ovatum , dorso fusco , limbo albicanti sat lato et aequali ; per to- 

 tum dorsum extenditur vitta media sub-testacea insequalis, postice utrinque sub- 

 dentata et versus anum in maculas transversas divulsa: pone medium ab hac 

 vitta exeunt utrinque linese vel fascia? dua? vel tres obliquse, breves, vix ad lim- 

 bum pertinentes. 



Long. c:a 5 millim. — Femina ignota. 



Patria: Italia (Canestrini). 



