some allied Genera of Hymenopterous Insects, 271 



Labium (fig. 4(?) parvum, membranaceum, lobis cUiobus 

 obtusis lateralibiis membranaceis. Palpi labiales 3-articu- 

 lati ; Imo longiori, 2do brevi obconico, 3to raulto majori, 

 securiformi, setoso. Antennce (fig. 4/) inter oculos in medio 

 faciei insertae, capite cum thorace longitudine fere asquales, 

 25-articu]ata3 ; articulo Imo crasso, 2do parvo, Stio primi 

 longitudine, reliquis longitudine sensim decrescentibus, api- 

 calibus minutissimis et gracilibus. Collum breve. Thorax 

 ovato-obconicus ; mesothoracis tergo latiori, parapsidibus 

 distinctis. Abdomen in parte infera apicali metathoracis in- 

 sertum (fig. 4j\ convexum, ovatum, antice et postice paullo 

 attenuatnm, apice deflexo, petiolo nullo, tergo 5-annulato; 

 ventre etiam 5-annulato, ano etiam apparente. Alc^ anticse 

 formae et magnitudinis ordinariae ; anticae longitudine thoracis 

 et abdominis ; vena postcostali e costa remota, stigma 

 mediocre, cellula una marginali, 4 submarginalibus ; Ima 

 magna, apice acuminata, (vena prima recurrenti cum vena 

 Ima transverso-cubitali continua,) 2da parva, elongato-tri- 

 angulari, 3tia parva quadrata venam secundam excipienti, 

 4ta apicem ala3 attingente. Ales posticae venis distinctis. 

 Pedes graciles, longitudine mediocres ; trochanteres biarticu- 

 lati (fig, 4g-), in pedibus anticis longi. Tibice 4 posticae 

 apice bicalcaratse. Tarsi graciles, unguibus apice bifidis 

 (fig. 4/0. 

 This extraordinary genus exhibits so many discordant charac- 

 ters that its real affinities must remain at present undetermined. 

 Were the antennae broken off it would at first siijht be regarded 

 as a male Midillce, of which it has completely the habit, whilst 

 the veining of the fore wings is very similar to that of Myrmosa ; 

 in fact, in this character, both in the fore and hind wings, we have 

 a complete fossorial insect, none of the Pupivora exhibiting so 

 perfect a development of the veins of the wings, especially of the 

 hind pair. The form of labrum exhibited by this insect is found 

 also in Vespa, as well as in Sapyga, which last genus also strik- 

 ingly agrees with Trigonalys in the form of the mandibles, and 

 also nearly in the veins of both fore and hind wings. With such 

 characters we might almost be justified in regarding the insect as 

 belonging to the Aculeata, and as an anomalous form of the 

 Mutillidde, or Sapygidce, more especially as we know that in the 

 clavate antennas of Sapyga, and tlie flabellate ones of Psammo- 

 therma, the antennEC of that family are liable to anomalous modi- 

 fications of form, whilst many Coleoplera teach us that an increased 



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