ASnMEAD : CLASSIFrCATrOX OF TITR CirAT.rTD FLTF.S 259 



Marginal vein hardly twice the length of the stiguial vein ; antenna' ll-j()iMtc<l; alulomen not long, 



lanceolate Aximopsis Ashinead, gen. nov. (type A. morio Ashm.). 



3. Marginal vein four or more times longer than the stigmal ; antenna; ll-jointeil, the funicle. joints long, 



binodose, each joint with two whorls of long hairs Axima Walker. 



Marginal vein hardly twice the length of the stigmal vein Aximopsis Ashmead. 



'rmr.K II. hosomiiii. 



All the species falling in this trihe^are phytophagous and thus dilfcr in habits 

 h-oin all of the other tnl)cs. 



The group approaches veiy close to the Eiori/foiiiiiii and many of the species 

 were at first described under the genus Eurytonui. There is, however, a well 

 marked structural difference between them, and the tribe may Ix' easil}' separated 

 by the characters made use of in my table i)f tribes. In having a long metathorax 

 and in the antennal characters of most of the genera, the Imsomini approach 

 nearest to the Axiinmi, but the horned head in the latter is suflficient to keep them 

 apart. 



TABLE OF GENERA. 



1 . Females 2 



Males 8 



2. Apterous 7 



Winged. 



Marginal vein always longer than tlie stigmal vein 3 



Marginal vein shorter than the stigmal vein, the latter very oI)li((uo, extending off from the 

 marginal at an angle of thirty degrees. 



Head and thorax umbilicately punctate, the frons with a deep antennal fuiiow ; abdo- 

 men elongate, conic-ovate, the dorsal segments subequal, as in Isosoma. 



Isosomodes Ashmead (type Isosoma gigantca Ashm.). 



3. Metathorax sloping or rounded behind, not abruptly and squarely truncate behind 4 



Metathorax quadrate, abruptly and squarely truncate behind. 



Me.sonotum delicately umbilicately punctate; abdomen ovate, slenderer than the thorax, the 

 second segment the longest, the others aliout of an e<iiial length. 



Isosomorpha Ashmead (type T. cin-upiv Ashm.). 



4. Thorax more or less distinctly umbilicately punctate, punctate or shagreened, opaque, never smooth 



and shining ; antennie usually 11-jointed, with 1 ring-joint, the funicle 5-jointed 5 



Thorax smooth and shining, impunetate or at the most feebly microscopically shagreened 6 



5. Me-sonotum umbilicately puuctivte, punctate or rugulose ; abdomen usually long, conically pointed, 



the segments subecpuil in length, the fourth not or only slightly longer than the third. 



Isosoma A\'alker (type Ichneumon verlicellata Fabr.). 

 Mesonotum with the middle lobe nearly sinonth, delicately i)unetate, with usually delicate transverse 

 aciculations anteriorly ; abdomen very long, conically pointed, the fourth segment very long. 



Euoxysoma Ashmead (type Systole hrachyptera Ashm.). 

 (i. Pedic'el longer than the fii-st joint of the funicle, the joints of the latter moniliform or nearly ; abdomen 

 ovate, with the fourth segnunit much longer than the others, except the second ; ppstmarginal vein 

 scarcely longer than the stigmal vein Isosomocharis .Vshmead (tyjie I. siilait Ashm.). 



