Macrohydnobius Peck & Cook 2009
Creators: name: Peck, Stewart B.
name: Cook, Joyce
Publisher: name: Zenodo
Year: 2009
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Leiodidae
Macrohydnobius

description: Key to Species of Macrohydnobius   
1 Protibial spurs enlarged, elongate (e.g. Figs. 103, 110, 118). Males.......................................................................... 2  
 - Protibial spurs not modified. Females (Note: female of M. tibiocalcaris unknown).................................................. 7   
2 Without a tooth on outer margin of left mandible (Figs. 102,109, 117)..................................................................... 3  
- With small tooth on outer margin of left mandible (Figs. 124, 133)........................................................................... 5  
 3 Elongate protibial spur inserted before base (Fig. 110); elytral intervals with minute punctures as well as larger punctures................................................................................................................................................... M. simulator   
- Elongate protibial spur inserted at or near base (Figs. 103, 118); elytral intervals without minute punctures.......... 4  
 4 Parameres short, about 1 / 3 length of median lobe, not partially enveloping median lobe (Fig. 104)... M. matthewsi   
 - Parameres longer, partly enveloping sides of broad median lobe (Fig. 119)....................................... M. crestonensis   
 5 Apical 1 / 5 of median lobe tapering sharply to narrow apex (Fig. 142); eastern species................... M. tibiocalcaris   
- Median lobe gradually tapering apically (Figs. 127, 136); western species............................................................... 6  
 6 Median lobe narrow, internal sac at middle with two distinct areas of dense scale-like setae (Figs. 127, 128).............................................................................................................................................................................. M. contortus   
 - Median lobe less narrow, internal sac at middle with a pair of multidentate sclerites (Fig. 136, arrow) M. montanus   
7 Without a tooth on outer margin of both mandibles................................................................................................... 8  
- With a tooth on outer margin of both mandibles (Figs. 125, 134)............................................................................. 10  
 8 Coxites of female genitalia broad and flat with narrow apices curved dorsad, styli inserted on ventral face of coxites (Fig. 121)............................................................................................................................................. M. crestonensis   
- Coxites of female genitalia elongate, cylindrical; styli inserted at apices of coxites (Figs. 106, 113)........................ 9  
 9 Color usually reddish brown; pronotum clearly widest in posterior one-half; antennal club robust (Fig. 101)............................................................................................................................................................................. M. matthewsi   
 - Color usually dark brown; pronotum longer, narrower, sides weakly rounded; antennal club narrow (Fig. 108).......................................................................................................................................................................... M. simulator   
 10 Sternite 8 deeply emarginate apically (Fig. 129)...................................................................................... M. contortus   
 - Sternite 8 truncate apically (Fig. 137)..................................................................................................... M. montanus
description: Published as part of Peck, Stewart B. & Cook, Joyce, 2009, Review of the Sogdini of North and Central America (Coleoptera: Leiodidae: Leiodinae) with descriptions of fourteen new species and three new genera, pp. 1-74 in Zootaxa 2102 (1) on pages 37-38, DOI: 10.11646/zootaxa.2102.1.1, http://zenodo.org/record/5310884