458 SUMMAKY OF CUKRENT RESEAKCHES RELATING TO 



branch of Dyar's Bombycides (Agrotides), since to this presumptive 

 lineage the Papilionides are apparently alien. For the general pattern 

 of the veining of the Lycaeni-Hesperiadae is repeated in the Agaristid 

 branch of the Bombycides, equally without any indication of affinity 

 with the Papilionid type. He compares his diphyletic tree with the 

 monojmyletic schemes of Packard and Hampson. 



Egg-formation in Rhizotrogus solstitialis.* — Otto Eabes recalls 

 the fact that it was in this beetle that Korschelt described the curious 

 ingrowth of folds of the follicular epithelium into the vitellus of the egg. 

 He has had an opportunity of repeating those observations, and making 

 a further investigation of the ovarian tubes. The ovary belongs to the 

 type with terminal chamber filled with numerous nuclei. The young 

 eggs have a massive vitellus and a clear nucleus ; they are surrounded 

 by numerous small cells. These follicular cells form folds which pene- 

 trate the egg, and apparently serve to feed the rapidly growing egg. 

 The folds occur only in young eggs, and are not seen in the later stages 

 when the chorion becomes cuticularised. The author also noticed 

 certain peculiarities in regard to the germinal vesicle, which, apparently 

 as a nutrition phenomenon, approaches the follicle wall and becomes 

 flattened against it. 



Male Genitalia in Coleoptera.|— Dr. L. Bordas has studied the male 

 organs of various members of the Cerarnbycidas. In regard to histology, 

 he finds that the testes consist of a number of conical ampullae converg- 

 ing towards a central reservoir. In the nymph the ampullae are largely 

 filled by spermatozoa, but towards the periphery spermatogonia in 

 various stages of development occur. 



Continuing his investigation of this subject,^ the author describes 

 the male geuital organs in beetles with compound and fasciculated testes, 

 viz. Aphodiinae, Coprinae, Geotrupinae, Melolonthinae, Rutelinae, Luca- 

 nidae, Cetoninse, Chrysomelidae (except in some genera), Cerambycidse, &c. 

 In all these the organs are almost uniform, and include : — (1) two testes 

 composed of spermatic ampullae ; (2) a pair of cylindrical vasa defer- 

 entia, swollen on their course to form seminal vesicles ; (3) two acces- 

 sory glands (except in Cetoninse) ; and (4) an ejaculatory duct, unpaired 

 throughout (except in some Longicorns), and generally dilated at its 

 origin. 



Mouth-Parts of Nematocera.§ — Mr. Vernon L. Kellogg has ex- 

 amined the mouth parts in a large number of Nematocerous Diptera, 

 and finds that they consist of a labrum-epipharynx ; a pair of mandibles, 

 which are always absent in the males, and in some cases in the female 

 also ; a pair of maxillae, with never more than a single maxillary lobe, 

 which may occasionally be absent ; and a labrum without palps, with 

 the terminal lobes showing various degrees of coalescence. The ten- 

 dency of specialisation is to the reduction and loss of mandibles and 

 maxillae, and the development of the labrum as a "rasping, lapping 

 organ." 



* Zeitschr. wiss. Zool., lxvii. (1900) pp. 310-8 (1 pi. and 1 fig.). 



t Ann. Soc. Ent. Fiance, Ixviii. (1899) pp. 508-13 (1 pi.). 



t Comptes Rendus, cxxx. (1900) pp. 738-40. 



§ Psyche, viii. (1899) pp. 303-300, 327-30, 346-8, 355-9, 363-5 (11 figs.)- 



