ORDER—HYMENOPTERA. 
Famity—TENTHREDINID&. 
PERANTHERIX. 
Genus novum: corpus parvum; al satis late; stigmate magno, cellula unica marginali apice clauso 
ramulumque minutissimum apicalem emittente, cellulis submarginalibus tribus, prima elongata, venam primam 
recurrentem accipiente, secunda mediocri, venam secundam recurrentem, in medio marginis postici, accipiente, 
tertia magna; antenne (fig. 1a) parve 6-articulate articulis 1 et 2 brevibus, 3-6 longioribus, setas longas, 
emittentibus, sexto ad apicem acuminato seta longa terminali instructo; pedes graciles; tibiis 4 posticis pone 
medium extus spinula parva, calcaribusque duobus apicalibus instructis ; tarsorum articulis simplicibus ; abdomen 
parvum. 
In the enlarged scapule of the collar, and the single marginal and three submarginal cells, this genus 
approaches Pterygophorus, whilst the appendiculated marginal cell and the spur in the middle of the four hind 
tibiz are more characteristic of the Hylotome; the antennw are, however, quite peculiar to the little insect 
on which I have proposed the present Genus. 
PERANTHERIX PUMILIO. 
Puate XX, Fic. 1. 
Niger albido-varius: alis hyalinis iridescentibus, stigmate albido extus fusco; pedibus albidis; tarsorum 
apicibus fuscis. 
Long. corp. lin. 2; expans. alar. lin. 44= mill. 10. 
Habitat; Amazonia (Bates). In Mus. Hopeiano Oxonie. 
Head transverse black, finely punctured ; antennz short, basal joints buff, terminal joints becoming gradu- 
ally darker brown, with long sete terminated by a single long arista; thorax black, punctured, the scapulze of 
the collar and the tegule yellowish buff; the basal segment of the abdomen is broadly margined with buff, the 
inner edge of the pale colour being sinuated, the five following segments have a triangular patch of the same 
colour on each side of the hind margin, and the remaining terminal segments are also pale coloured ; the wings 
are hyaline, very slightly stained with brown, and iridescent. 
In the unique specimen in the Hopeian Collection there is a minute dot near the extremity of the first 
submarginal cell. 
BRACHYTOMA. (Klug MS.) - 
Antenne multi-articulate, maris biramose: ale magne, antice cellula 1 marginali apice appendiculata ; 
4 submarginalibus, secunda guttula medio instructa ; tibiz calcari medio externo vel interno haud praedite. 
Genus Lophyro proximum ; locus, America Meridionalis. 
Species 1—BRACHYTOMA NIGRICEPS. 
Puate XX, Fie. 2. 
Fulva, capite nigro: labro fulvo ; antennis fuscis 20-articulatis, articulis 2 basalibus fulvis, 3-18 biramosis, 
ramis brevibus, antennarum apicem versus sensim abbreviatis ; 19mo uniramoso, 20 integro brevi ovato ; mesonoto 
