. Bulletin. Natural history; Natural history. November, 1961 Smith: Amphibians and Reptiles of Illinois 63 Bishop (1941) records that pairing of males and females occurs in the fall but that oviposition does not take place until late spring. A gravid female lays approximateh' 100 eggs, usually on the underside of a sub- merged rock or log. Each egg is 5 to 6 mm. in diameter and suspended in a jelly-like sac. The eggs require about 2 months to hatch. The young are described briefly in the para- graph describing ontogenetic variation. Illinois Distribution.—Necturus is state- wide in distributio
. Bulletin. Natural history; Natural history. November, 1961 Smith: Amphibians and Reptiles of Illinois 63 Bishop (1941) records that pairing of males and females occurs in the fall but that oviposition does not take place until late spring. A gravid female lays approximateh' 100 eggs, usually on the underside of a sub- merged rock or log. Each egg is 5 to 6 mm. in diameter and suspended in a jelly-like sac. The eggs require about 2 months to hatch. The young are described briefly in the para- graph describing ontogenetic variation. Illinois Distribution.—Necturus is state- wide in distribution and probably abundant in suitable streams in every Illinois county, fig. 50, but it is difficult to collect by usual collecting methods. The accompanying map reflects the parts of Illinois where the most intensive collecting has been done, rather than the actual abundance of the species. Collections have recently been augmented by specimens obtained with the aid of electric. Fig. 50.—Distribution of Necturus maculo- sus. The subspecies macitlosus occurs through- out Illinois. Solid circles indicate localities represented by specimens examined during this Study; open circles, localities represented by published records believed to be valid. The lower map depicts the total range of the species in the United States. shocking equipment that aquatic biologists are now using. Although undocumented by specimens, published records for the following localities are believed valid and are indicated on the distribution map by hollow symbols: Coles County: Cooks Mill (Hankinson 1917); Cook County: Evanston (Milner 1874); Wilmette (Necker 1939r) ; Jackson Coun- ty: Big Muddy River (Cagle 1942a) ; Kane County: Carpentersville (Schmidt & Necker 1935) ; Lee County: Sublette (Pope 1944^); Madison County: (Hur- ter 1893) ; Marshall County: Henry (H. Garman 1892); Ogle County: Oregon (H. Garman 1892); Peoria County: Pe- oria (H. Garman 1892); Rock Island County: ]\loline (Howard 1951); W
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Keywords: ., booka, bookcentury1900, bookdecade1910, booksubjectnaturalhistory
