114 Orper—H YMENOPTERA. 
Genus—SIREX. 
Species 1—SIREX FULVOCINCTUS. (Mas.) 
PuateE XXI, Fie. 1. 
Niger, punctatus, nigro-setosus: thoracis segmento postico cwrulescente; abdomine purpureo-nigro, seg- 
mentis duobus intermediis lete aurantiis; antennis caput et thoracem equantibus 19-articulatis, articulis 3tio, 
4to, et 5to fulvis (hujus apice nigro); pedibus nigris, tibiis tarsisque quatuor anticis fulvis; basi tibiarum et 
articulo 4to et basi 5ti tarsorum in pedibus 2 posticis, etiam fulvis; horum tibiis tarsisque compressis ; alis 
pallide fulvis margine postico fuscescente, stigmate venisque brunneis. 
Long. corp. lin. 10 ; expans. alar. antic. lin. 16. 
Habitat ; America Septentrionalis. In Mus. Hopeiano Oxoniz. 
The vein which closes the hind part of the first submarginal cell is united to the vein which closes the 
anterior basal subcostal cell, at a slight distance from the origin of the vein which forms the long posterior 
margin of the long second submarginal cell, and the median vein throws off a short branchlet before its 
extremity, forming a small incomplete irregular 5-sided discoidal cell. 
Species 2—SIREX LATIFASCIATUS. (Mas.) 
Puate XXI, Fie. 2. 
Niger, punctatus, setosus: abdomine purpurascente nigro; segmentis 2do, 3tio, 4to, et 5to fulvis; antennis 
23-articulatis, articulo 4to et sex sequentibus obscure rufis; apicibus sensim nigricantibus ; capite convexo, angulis 
duobus posticis pone oculos flavis ; collaris angulis anticis porrectis fulvis; abdomine subopaco margine postico 
segmentorum nitido ; apice acuto, serrulato; femoribus omnibus nigris tibiis et tarsis 4-anticis fulvis, tibiarum 
compressarum 2 posticarum basi albida, tarsorum articulis duobus apicalibus sub-fulvis ; alis obscure fulvescenti- 
bus apice vix obscurioribus, stigmate brunneo. 
Long. corp. lin. 103; expans. alar. antic. lin. 154. 
Habitat; America Septentrionalis. In Mus. Hopeiano Oxonie. 
The vein which closes the hind portion of the first submarginal cell is continuous with the vein at the end 
of the long anterior or subcostal cell, causing the first submarginal cell to be shorter and more oblique than in 
the preceding species ; and the vein which forms the hind margin of this anterior or subcostal cell does not emit 
a branch near its apex, so that the small incomplete discoidal cell seen in the preceding species is here wanting. 
Species 3—SIREX GRACILIS. 
Prats XXI, Fic. 4. 
Species quasi intermedia inter S. Abaddon et S. spectrum. Elongatus eylindricus, cyaneo-niger, punctatissimus, 
abdomine magis purpurascenti, segmento ultimo sensim ad apicem acuminato, et serrulato; oviductu dimidium 
abdominis longitudine «quanti; antennis elongatis nigris gracilibus 21-articulatis, fere ad medium abdominis 
attingentibus ; pedibus nigris gracilibus; alis nigricantibus purpureo parum tinctis. 
Long. corp. lin. 12; oviduct. ultra apic. abdom. lin. 4; expans. alar. antic. lin. 163. 
Habitat; America Septentrionalis, arboribus terebinthinis (Raddon). In Mus. Hopeiano Oxonie (olim 
nostr.) 
The abdomen is rather more than twice the length of the head and thorax. The portion of the ovipositor 
which extends beyond the serrated apex of the abdomen equals half the length of the whole abdomen, to which 
also the wings are equal in length. The vein which closes the first submarginal cell forms a regular curve with 
that which closes the hind part of the extremity of the long subcostal cell. The vein which closes the hind 
margin of this cell emits a small branch near its apex, forming a small incomplete discoidal cell. 
