on the GEstri and Cuterebrte of various Animals. 
93 
CEstrus Libycus. 
Cinereus, thorace punctis 4 alisque punctis 3 nigris. 
Habitat in iEgypto, D. Riippel. 
Descr. Mas magnitudine et statura fere (E. Ovis. Totum corpus cum capite cylindriforme. 
Facies magna, pars inferior cum antennis flavescenti-alba; vertice fusco, stemmatibus 
3 nigris. Oculi rufescentes, majores. Thorax cinereus, antice foveola impressus, utrin- 
que punctis duobus pertusis atris, posterioribus elongatis. Scutellum magnum, cine- 
reum, latenbus nigro inquinatum, atomisque duobus mediis nigris. Abdomen breve, 
obtusum, argenteo-albidum, ad atera scabriusculum, punctis fuscis nonnullis elevatis 
quasi respiratoriis; subtus album. Pedes rufescentes, femoribus annulo unico, tibiis 
annulis duobus, nigris. Alee albo-pellucidas, basi nigricantes, puncto fasciaque trans- 
versa flexuosa costae adnexa lineolaque, atris. 
For the following remarkable species I am indebted to my amiable friend 
Mr. W. E. Shuekard, who obligingly presented it with the name also kindly 
annexed. 
CEstrus Clarkii. 
Caerulescenti-fuscus, alis obscuris antice sinuatis basin versus atro bipunc- 
tatis. 
Habitat ad Caput Bonas Spei. W. E. Shuekard, monographus cel. Insectorum Hymen- 
opterorum, qui, una cum nomine triviali, lubentissime mihi communicavit. 
Descr. CEstro Ovis bis major. Facies nuda (uti totum corpus), lata, flavo-albida, antennis 
alte immersis nigris; oculi grisei; vertex fuscus, punctis duobus parvulis nigris luci- 
dis. Thorax ratione abdominis grossus, oblongus, alis postice insertis. Scutellum 
majusculum, dorso canaliculatum. Abdomen fusco-caeruleum, breve, ovatum, ex lineis 
impressis quasi in tesseras profunde divisum, dorso in medio longitudinaliter porcatum 
seu linea assurgenti munitum. Femora vix compressa, nigra, geniculis tarsisque griseis. 
Unguiculee valde divergentes, incurvm, membranulis duabus interpositis. Alee fuse®, ad 
costam retro sinuatae, macula punctoque baseos atris distinctissimis, alteroque minimo 
in ipsa costa. Halteres flavo-lacteas, tumidse, majores, subtriquetrm. 
Conjicit amicissimus Shuekard hanc speciem inter pecora majora Capensia habitasse. 
I may here remark, that my kind friends have three times endeavoured to 
connect my name with an insect, and twice has it been proved to be nuga¬ 
tory by my own researches. The first was by my friend Jurine, at Geneva, 
attaching my name to a splendid Tentliredo, found by me near Orbe. This I 
