345 
ME. LUBBOCK ON THE OVA AND PSEUDOVA OF INSECTS. 
Pterostichus vernalis, Apliodius fimetarius, Cassida equestris, and Coccidula pectoralis , 
eight in BemUdium femoratim and Loemophloeus monilis; nine in Nitidula ohsoleta and 
Biaperis boleti ; ten to twelve in Cicindelince^ Carabus granulatus, Jiortensis (and violaceus ) , 
twelve in Clerus formicarius ; fourteen to sixteen in Hyfhydrus ovatus, Hydroporus 
palustris, Coccinella globosa and guinquepunctata ; about twenty in many Chrysomelidm ; 
twenty-five to thirty in Elater aterrimus and Cocdnella septempunctata ; thirty to forty 
in Allecula morio, Lagria hirta, Colyinbetes fuscus, Acilius sulcatus, and most of the 
large species of JDytiscus. The largest number observed by Stein was fifty-two, in Helops 
caraboides. 
According to Feet and Leuckaet {1. c), Lixus and Anthonomus have only two egg-tubes, 
Hypophloeus only three, most Longicorns eight to ten, and most Buprestidm twenty to 
thirty. Buemeistee {1. c.) ascribes seven tubes to Silpha atrata, seven to ten to Tene- 
brio, Leptura and Saperda^ from ten to fifteen to Bytiscus, Staphylinus, HydropMlus, 
Cerambyx, and Lamia tristis, and thirty to Blaps mortisaga. 
According to Buemeistee, Barcophaga carnaria possesses only one egg-tube, and Melo- 
phagus ovinus* has only two ; but in the majority of the Diptera they are short and very 
numerous. 
In the Hymenoptera Chelonus has only two, and Odynerus only three egg-tubes. 
According to Feet and Leuckaet, AntMdium, Crabro, Chrysis, and Xylocopa have also 
three ; but L^on Dufoue attributes four to the two latter genera. Anthophora, Crocisaf, 
Melectaf, Vipiof, and Bombusf have four: Feet and Leuckaet indeed attribute eight 
to Bombus, and Buemeistee from seven to ten ; but I only found four in B. terrestris 
and B. rduscorum. 
Xomada^ and Sapyga’\, and according to Feey and Leuckaet, all the Ichneumo- 
nidce, have five, but I find ten in Opliion luteum (Plate XVII. fig. 6). Leucospis’\, 
Chalcis^, and Eulophus'\, five or six; Formica rufa\\, 100 to 120; F. nigra, thirty to 
forty; Vespa vulgaris, seven; Psithyrus^, eight; Pimplaf, Paniscusf and Biapriaf, 
eight to ten; Athalia^ has twelve, but most of the Tenthredinidwf only ten; Myrmica 
and Xiphydriaf, twenty; Banchusf, twenty-five; Cynips, a considerable number; and 
Apis mellijica\ as many as 170. 
The number of egg-germs which are produced in each egg-tube oflers also many varia- 
tions, from Coccus on the one hand, in which there is only one, to Pontia on the other, 
in which there are, according to Heeold more than a hundred. 
The number is not, however, so easy to determine, as it might at first sight appear to 
be ; for as the eggs are produced successively, there must in every case be a time when 
only one egg-germ is present, though this stage of development is generally past before 
the insect arrives at the perfect state. Moreover, before the last egg begins to grow 
the first one has generally already left the ovarian tube. These sources of error have 
* Lettckaet, 1 . c. 
J Buemeistee, Z. c. p. 187. 
II Leuckaet, 1 . c. 
t Leon Dueoue, Sur les Ortliopteres, &c., Mem. de I’lnstitut, 1841. 
§ Feet and Leuckaet, 1 . c. 
^ See Heeold, Entwickehingsgeschichte Scbmetterlinge, 1815, pi. 31. 
