52 BULLETIN 31, UNITED STATES NATIONAL MUSEUM. 



geuubus, tibiis tarsisque anteiioribus brnmieo-fuscis. Pectus nitidum, 

 plunibeiiiii, parcins pilosnni, phunula subalis et peritremate spiiaculo- 

 rum albidis, — Thomson, 



I cannot identify this species with any of the foregoing, though it 

 comes nearest to Af. tUjrinum. It is more than i)robable that it will be 

 found among those described by Bigot. 



The following species, described by Mr. Bigot, probably belong to this 

 .genus; yet l'l<ifijchirns should not be lost sight of in endeavoring to 

 identify them. It is very probable that some of them are synonyms 

 of species already describ^'d, but my material and patience are not 

 sufficient to determine them. M. pridnosmn I have given as a probable 

 synonym of 21. niellinmit. 



Melanosioina ? pruinosum. 



Mclanostomaf pruinosa Bigot, Ann. Soc. Ent. Fr., 1884. 79. 



i/a/>/7<ff.— California (Big.). 



9. Long. 8'"'". Antennis Julvis, apice fuscis ; fronte et facie nigris, 

 nitidis, uirinque flavo pridnosis; thorace ni/jro, obscure (vae.scente ; calyptris 

 alhis, haUeribns J'ulris, clavd fusca; ahdomine ni(jro opuco, sef/mento 2°, 

 titrinque, macula obliqud, oblongd, 3'* et 4", maculis utrinque latis^fere tri- 

 f/onis, 5°, lunulis lateralibus flaris; pedibus fJavidis, feinoribus tibiisque 

 fu,Hco annulatis, scepe evanescent ibus, tarsis posticisfuscanis, incisnrislate 

 flavidis; a I is hyalinis. 



Antennes fauves, bords superieurs, extrcSmite et chete, bruns: front 

 et face d'un uoir luisant, converts de chaque cote j)ar une pruiuosite 

 jaunatre qui s'etend notablement au-dessus des antennes ; thorax, ecus- 

 sou d'un uoir luisant a reflets bronzes ; fanes a duvet blanchatre: cuil- 

 lerons blaucs, balauciers fauves, massue brunatre : abdomen d'un uoir 

 opaquv', biise et extremity un peu luisantes, 2*' segment avec deux ma- 

 cules obliques, ovaloid.es, divergentes du cote auterieur, 3"^ et 4*^, avec 

 deux largvs macules basilaires, trigonales, joiguant les cotes, d'un jaune 

 fauve; pieds testaces, cuisses et tibias avec iles anneaux brunatres par- 

 fois peu distincts, tarses avec I'extremite brunatre, les i)osterieurs j^liis 

 fonces avec les articulations largement jauuatres ; ailes hyalines. An- 

 tennes, 3« segment ovale; abdomen ^troit; ailes d6passant a peine sou 

 extremity. Oalifornie — 2 specim. 



Melanostoma ? pictipes. 



Melanosfoma^ pictipes Bigot, Aun. Soc. Ent. Fr., lf^84, 78. 



Habitat. — California (Big'.). 



(?. Long, 9™'". Nigra, parum nitida. Antennis castaneis; fronts 

 nitidd; facie, utrinqiie cinereo pruinosd; calyptris et halter ibus fulvis; 

 abdomine nigra opaco, basi albido pilosula, apice et utrinque nitido; ma- 

 culis basal ibus, utrinque, fere trigonis, cinereis j)arum metallescentibus; ped- 

 ibus fulvis, femor ibus tibiisque late fusco nigro aunulatis tarsis apice in- 

 infuscatis, posticis fuscis; alisfere hyalinis, macula stigmaticali testaced. 



Antennes noires, 3® segment et chete d'un fauve obscur: front noir, 

 luisant k polls uoirs ; face noire, callosity luisaote, c6t(5s ti reflets grisa- 



